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Tuesday, March 14, 2023

Carbon nanotube chemistry

From Wikipedia, the free encyclopedia

Carbon nanotube chemistry involves chemical reactions, which are used to modify the properties of carbon nanotubes (CNTs). CNTs can be functionalized to attain desired properties that can be used in a wide variety of applications. The two main methods of CNT functionalization are covalent and non-covalent modifications.

Because of their hydrophobic nature, CNTs tend to agglomerate hindering their dispersion in solvents or viscous polymer melts. The resulting nanotube bundles or aggregates reduce the mechanical performance of the final composite. The surface of CNTs can be modified to reduce the hydrophobicity and improve interfacial adhesion to a bulk polymer through chemical attachment.

Chart summarizing options for the chemical modification of carbon nanotubes.

Covalent modification

Covalent modification of carbon nanotubes.

Covalent modification attaches a functional group onto the carbon nanotube. The functional groups can be attached onto the side wall or ends of the carbon nanotube. The end caps of the carbon nanotubes have the highest reactivity due to its higher pyrimidization angle and the walls of the carbon nanotubes have lower pyrimidization angles which has lower reactivity. Although covalent modifications are very stable, the bonding process disrupts the sp2 hybridization of the carbon atoms because a σ-bond is formed. The disruption of the extended sp2 hybridization typically decreases the conductance of the carbon nanotubes.

Oxidation

The purification and oxidation of carbon nanotubes (CNTs) has been well represented in literature. These processes were essential for low yield production of carbon nanotubes where carbon particles, amorphous carbon particles and coatings comprised a significant percentage of the overall material and are still important for the introduction of surface functional groups. During acid oxidation, the carbon-carbon bonded network of the graphitic layers is broken allowing the introduction of oxygen units in the form of carboxyl, phenolic and lactone groups, which have been extensively exploited for further chemical functionalisation.

First studies on oxidation of carbon nanotubes involved a gas-phase reactions with nitric acid vapor in air, which indiscriminately functionalized the carbon nanotubes with carboxylic, carbonyl or hydroxyl groups. In liquid-phase reactions, carbon nanotubes were treated with oxidizing solutions of nitric acid or a combination of nitric and sulfuric acid to the same effect. However, overoxidation may occur causing the carbon nanotube to break up into fragments, which are known as carbonaceous fragments. Xing et al. revealed sonication assisted oxidation, with sulfuric and nitric acid, of carbon nanotubes and produced carbonyl and carboxyl groups. After the oxidation reaction in acidic solution, treatment with hydrogen peroxide limited the damage on the carbon nanotube network. Single-walled carbon nanotubes can be shortened in a scalable manner using oleum (100% H2SO4 with 3% SO3) and nitric acid. The nitric acid cuts carbon nanotubes while the oleum creates a channel.

In one type of chemical modification, aniline is oxidized to a diazonium intermediate. After expulsion of nitrogen, it forms a covalent bond as an aryl radical:

On Water Nanotube Functionalization

Esterification/Amidation

Carboxylic groups are used as the precursor for most esterification and amidation reactions. The carboxylic group is converted into an acyl chloride with the use of thionyl or oxalyl chloride which is then reacted with the desired amide, amine, or alcohol. Carbon nanotubes have been deposited on with silver nanoparticles with the aid of amination reactions. Amide functionalized carbon nanotubes have been shown to chelate silver nanoparticles. Carbon nanotubes modified with acyl chloride react readily with highly branched molecules such as poly(amidoamine), which acts as a template for silver ion and later being reduced by formaldehyde. Amino-modified carbon nanotubes can be prepared by reacting ethylenediamine with an acyl chloride functionalized carbon nanotubes.

Halogenation reactions

Carbon nanotubes can be treated with peroxytrifluroacetic acid to give mainly carboxylic acid and trifluroacetic functional groups. The fluorinated carbon nanotubes, through substitution, can be further functionalized with urea, guanidine, thiourea and aminosilane. Using the Hunsdiecker reaction, carbon nanotubes treated with nitric acid can react with iodosobenzenediacetate to iodate carbon nanotubes.

Cycloaddition

Also known are protocols for cycloadditions such as Diels-Alder reactions, 1,3-dipolar cycloadditions of azomethine ylides and azide–alkyne cycloaddition reactions. One example is a DA reaction assisted by chromium hexacarbonyl and high pressure. The ID/IG ratio for reaction with Danishefsky's diene is 2.6.

The most well-known 1,3 cycloaddition reaction involves azomethine ylides reacting with carbon nanotubes, which are of great interest. The addition of a pyrrolidine ring can lead to a variety of functional groups such as second-generation poly(amidoamine) dendrimers, phthalocyanine addends, perfluoroalkylsilane groups, and amino ethyleneglycol groups. The Diels-cycloaddition reaction can occur, especially on fluorinated carbon nanotubes. They are known to undergo Diels–Alder reactions with dienes such as 2,3-dimethyl-1,3-butadiene, anthracene, and 2-trimethylsiloxyl-1,3-butadiene.

Radical addition

Top: electron micrographs showing interaction of CNTs with 4-(1-pyrenyl)phenyl radical (a) and its boronic ester (b). Bottom: corresponding models.

The modification of carbon nanotubes with aryl diazonium salts was studied first by Tour et al. Due to the harsh conditions needed for the in situ generated diazonium compound, other methods have been explored. Stephenson et al. reported using aniline derivatives with sodium nitrite in 96% sulfuric acid and ammonium persulfate. Price et al. demonstrated that stirring carbon nanotubes in water and treating with anilines and oxidizing agents proved to be a milder reaction. The diazonium chemistry functionalized carbon nanotubes which was used as a precursor to further modifications. Suzuki and Heck coupling reactions were performed on iodophenyl-functionalized carbon nanotubes. Wong et al. demonstrated mild photochemical reactions to silylate the carbon nanotubes with trimethoxysilane and hexaphenyldisilane.

Nucleophilic addition

Hirsch et al. conducted nucleophilic additions with organolithium and organomagnesium compounds onto carbon nanotubes. With further oxidation in air, they were able to create alkyl-modified carbon nanotubes. Hirsch was also able to show the nucleophilic addition of amines by generating lithium amides, leading to amino-modified carbon nanotubes.

Electrophilic addition

Nanotubes can also be alkylated with alkyl halides using lithium or sodium metal and liquid ammonia (Birch reduction conditions). The initial nanotube salt can function as a polymerization initiator and can react with peroxides to form alkoxy functionalized nanotubes. 

The alkyl and hydroxyl modification of carbon nanotubes was demonstrated with the electrophilic addition of alkylhalides by microwave irradiation. Tessonnier et al. modified carbon nanotubes with amino groups by deprotonating with butyl lithium and reacting with amino substitution. Balaban et al. applied Friedel-Crafts acylation to carbon nanotubes with nitrobenzene at 180 °C along with aluminum chloride.

Non-covalent modifications

Non-covalent modification of carbon nanotubes.

Non-covalent modifications utilize van der Waals forces and π-π interactions by adsorption of polynuclear aromatic compounds, surfactants, polymers or biomolecules. Non-covalent modifications do not disrupt the natural configuration of carbon nanotubes with the cost of chemical stability, and is prone to phase separation, dissociation in between two phases, in the solid state.

Polynuclear aromatic compounds

Some common polynuclear aromatic compounds that are functionalized with hydrophilic or hydrophobic moieties are used to solubilize carbon nanotubes into organic or aqueous solvents. Some of these amphiphiles are phenyl, naphthalene, phenanthrene, pyrene and porphyrin systems. The greater π-π stacking of aromatic amphiphiles such as pyrene amphiphiles had the best solubility compared to phenyl amphiphiles with the worse π-π stacking, lead to more solubility in water. These aromatic systems can be modified with amino and carboxylic acid groups prior to functionalizing the carbon nanotubes.

Biomolecules

The interaction between carbon nanotubes and biomolecules has been widely studied because of their potential to be used in biological applications. The modification of the carbon nanotubes with proteins, carbohydrates, and nucleic acids are built with the bottom-up technique. Proteins have high affinity to carbon nanotubes due to their diversity of amino acids being hydrophobic or hydrophilic. Polysaccharides have been successfully been used to modify carbon nanotubes forming stable hybrids. To make carbon nanotubes soluble in water, phospholipids such as lysoglycerophospholipids have been used. The single phospholipid tail wraps around the carbon nanotube, but the double tailed phospholipids did not have the same ability.

π-π stacking and electrostatic interactions

Molecules that have bifunctionality are used to modify the carbon nanotube. One end of the molecule are polyaromatic compounds that interact with the carbon nanotube through π-π stacking. The other end of the same molecule has a functional group such as amino, carboxyl, or thiol. For example, pyrene derivatives and aryl thiols were used as the linkers for various metal nanobeads such as gold, silver and platinum.

Mechanical interlocking

A particular case of non-covalent modification is the formation of rotaxane-like mechanically interlocked derivatives of single-walled nanotubes (SWNTs). In this strategy, the SWNTs are encapsulated by molecular macrocycle(s), which are either formed around them by macrocyclization, or pre-formed and threaded at a later stage. In MINTs (Mechanically Interlocked NanoTubes), the SWNT and organic macrocycle are linked by means of their topology, through a mechanical bond, combining the stability of the covalent strategies -at least one covalent bond must be broken to separate SWNT and macrocycle(s)- with the structural integrity of the classic noncovalent strategies -the C-sp2 network of the SWNT remains intact.

Characterization

A useful tool for the analysis of derivatised nanotubes is Raman spectroscopy which shows a G-band (G for graphite) for the native nanotubes at 1580 cm−1 and a D-band (D for defect) at 1350  cm−1 when the graphite lattice is disrupted with conversion of sp² to sp³ hybridized carbon. The ratio of both peaks ID/IG is taken as a measure of functionalization. Other tools are UV spectroscopy where pristine nanotubes show distinct Van Hove singularities where functionalized tubes do not, and simple TGA analysis.

Geography of the United States

From Wikipedia, the free encyclopedia
Political map of the United States.
Political map of the United States showing the 50 states, the District of Columbia and the 5 major U.S. territories.
Geography of The United States
USA topo en.jpg
ContinentNorth America
Coordinates38.000°N 97.000°W
AreaRanked 3rd/4th
 • Total9,826,675 km2 (3,794,100 sq mi)
 • Land93.24%
 • Water6.76%
Coastline19,920 km (12,380 mi)
BordersCanada: 8,864 km (5,508 mi)
Mexico: 3,327 km (2,067 mi)
Highest pointDenali
6,190.5 m (20,310 ft)
Lowest pointBadwater Basin,
−85 m (−279 ft)
Longest riverMissouri River,
3,767 km (2,341 mi)
Largest lakeLake Superior
58,000 km2 (22,394 sq mi)
ClimateDiverse: Ranges from Temperate in the North to Tropical in the far south. West: mostly semi-arid to desert, Mountains: alpine, Northeast: humid continental, Southeast: humid subtropical, Coast of California: Mediterranean, Pacific Northwest: cool temperate oceanic, Alaska: mostly subarctic, Hawaii, South Florida, and the territories: tropical
TerrainVast central plain, Interior Highlands and low mountains in Midwest, mountains and valleys in the mid-south, coastal flatland near the Gulf and Atlantic coasts, complete with mangrove forests and temperate, subtropical, and tropical laurel forest and jungle, canyons, basins, plateaus, and mountains in west, hills and low mountains in east; intermittent hilly and mountainous regions in Great Plains, with occasional badland topography; rugged mountains and broad river valleys in Alaska; rugged, volcanic topography in Hawaii and the territories
Natural resourcescoal, copper, lead, molybdenum, phosphates, rare earth elements, uranium, bauxite, gold, iron, mercury, nickel, potash, silver, tungsten, zinc, petroleum, natural gas, timber, arable land
Natural hazardstsunamis; volcanoes; earthquake activity around Pacific Basin; hurricanes along the Atlantic and Gulf of Mexico coasts; tornadoes in the Midwest and Southeast; mud slides in California; forest fires in the west; flooding; permafrost in northern Alaska
Environmental issuessevere water shortages, air pollution resulting in acid rain in both the US and Canada
Exclusive economic zone11,351,000 km2 (4,383,000 sq mi)

The term 'United States', when used in the geographical sense, refers to the contiguous United States, the state of Alaska, the island state of Hawaii, the five insular territories of Puerto Rico, Northern Mariana Islands, U.S. Virgin Islands, Guam, and American Samoa, and minor outlying possessions. The United States shares land borders with Canada and Mexico and maritime borders with Russia, Cuba, The Bahamas, and other countries, in addition to Canada and Mexico. The northern border of the United States with Canada is the world's longest bi-national land border.

Area

From 1989 through 1996, the total area of the US was listed as 9,372,610 km2 (3,618,780 sq mi) (land + inland water only). The listed total area changed to 9,629,091 km2 (3,717,813 sq mi) in 1997 (Great Lakes area and coastal waters added), to 9,631,418 km2 (3,718,711 sq mi) in 2004, to 9,631,420 km2 (3,718,710 sq mi) in 2006, and to 9,826,630 km2 (3,794,080 sq mi) in 2007 (territorial waters added). Currently, the CIA World Factbook gives 9,826,675 km2 (3,794,100 sq mi), the United Nations Statistics Division gives 9,629,091 km2 (3,717,813 sq mi), and the Encyclopedia Britannica gives 9,522,055 km2 (3,676,486 sq mi) (Great Lakes area included but not coastal waters). These sources consider only the 50 states and the Federal District and exclude overseas territories. The US has the 2nd largest Exclusive Economic Zone of 11,351,000 km2 (4,383,000 sq mi).

By total area (water as well as land), the United States is either slightly larger or smaller than the People's Republic of China, making it the world's third or fourth-largest country. China and the United States are smaller than Russia and Canada in total area but are larger than Brazil. By land area only (exclusive of waters), the United States is the world's third largest country, after Russia and China, with Canada in fourth. Whether the US or China is the third largest country by total area depends on two factors: (1) The validity of China's claim on Aksai Chin and Trans-Karakoram Tract (both these territories are also claimed by India, so are not counted); and (2) How the US calculates its surface area. Since the initial publishing of the World Factbook, the CIA has updated the total area of the United States several times.

General characteristics

A satellite composite image of the contiguous United States. Temperate and Subtropical forests, of deciduous, coniferous, broadleaved evergreen, and mixed vegetation, as well as grasslands, montane forests, and croplands, prevail in the east, transitioning to prairies (semi-arid steppe), boreal forests, the Rockies in the west and deserts in the southwest. In the northeast, the coasts of the Great Lakes and Atlantic seaboard host much of the country's population.
 
A satellite composite image of the state of Hawaii. Volcanoes prevail on the Big Island. The islands have rugged coastlines, sandy beaches and a tropical environment, although temperatures and humidity tend to be less extreme because of near-constant trade winds from the east.
 

The United States shares land borders with Canada (to the north) and Mexico (to the south), and a territorial water border with Russia in the northwest, and two territorial water borders in the southeast between Florida and Cuba, and Florida and the Bahamas. The contiguous forty-eight states are otherwise bounded by the Pacific Ocean on the west, the Atlantic Ocean on the east, and the Gulf of Mexico to the southeast. Alaska borders the Pacific Ocean to the south and southwest, the Bering Strait to the west, and the Arctic Ocean to the north, while Hawaii lies far to the southwest of the mainland in the Pacific Ocean.

Forty-eight of the states are in the single region between Canada and Mexico; this group is referred to, with varying precision and formality, as the contiguous United States, and as the Lower 48. Alaska, which is included in the term continental United States, is located at the northwestern end of North America.

The capital city, Washington, District of Columbia, is a federal district located on land donated by the state of Maryland. (Virginia had also donated land, but it was returned in 1849.) The United States also has overseas territories (Insular areas) with varying levels of autonomy and organization: in the Caribbean territories of Puerto Rico and the U.S. Virgin Islands (formerly the Danish Virgin Islands, purchased by the US at the beginning of WW2), and in the Pacific the inhabited territories of American Samoa, Guam and the Northern Mariana Islands, along with a number of uninhabited island territories. Some of the territories acquired were a part of United States imperialism, or to gain access to the east.

Nearly all of the United States is in the northern hemisphere—the exceptions are American Samoa and Jarvis Island.

Physiographic divisions

Denali, Alaska, is the highest point in North America at 20,310 ft (6,190.5 m).

The eastern United States has a varied topography. A broad, flat coastal plain lines the Atlantic and Gulf shores from the Texas-Mexico border to New York City, and includes the Florida peninsula. This broad coastal plain and barrier islands make up the widest and longest beaches in the United States, much of it composed of soft, white sands. The Florida Keys are a string of coral islands that reach the southernmost city on the United States mainland (Key West). Areas further inland feature rolling hills, mountains, a diverse collection of temperate and subtropical moist and wet forests. Parts of interior Florida and South Carolina are also home to sandhill communities. The Appalachian Mountains form a line of low mountains separating the eastern seaboard from the Great Lakes and the Mississippi Basin. New England features rocky seacoasts and rugged mountains with peaks up to 6200 feet and valleys dotted with rivers and streams. Offshore Islands dot the Atlantic and Gulf coasts. A recent global remote sensing analysis suggested that there were 6,622 km² of tidal flats in the United States, making it the 4th ranked country in terms of tidal flat area.

The five Great Lakes are located in the north-central portion of the country, four of them forming part of the border with Canada; only Lake Michigan is situated entirely within the United States. The southeast United States, generally stretching from the Ohio River southwards, includes a variety of warm temperate and subtropical moist and wet forests, as well as warm temperate and subtropical dry forests nearer the Great Plains in the west of the region. West of the Appalachians lies the lush Mississippi River basin and two large eastern tributaries, the Ohio River and the Tennessee River. The Ohio and Tennessee Valleys and the Midwest consist largely of rolling hills, interior highlands and small mountains, jungle-like marsh and swampland near the Ohio River, and productive farmland, stretching south to the Gulf Coast. The Midwest also has a vast amount of cave systems.

The Great Plains lie west of the Mississippi River and east of the Rocky Mountains. A large portion of the country's agricultural products are grown in the Great Plains. Before their general conversion to farmland, the Great Plains were noted for their extensive grasslands, from tallgrass prairie in the eastern plains to shortgrass steppe in the western High Plains. Elevation rises gradually from less than a few hundred feet near the Mississippi River to more than a mile high in the High Plains. The generally low relief of the plains is broken in several places, most notably in the Ozark and Ouachita Mountains, which form the U.S. Interior Highlands, the only major mountainous region between the Rocky Mountains and the Appalachian Mountains.

The Great Plains come to an abrupt end at the Rocky Mountains. The Rocky Mountains form a large portion of the Western U.S., entering from Canada and stretching nearly to Mexico. The Rocky Mountain region is the highest region of the United States by average elevation. The Rocky Mountains generally contain fairly mild slopes and wider peaks compared to some of the other great mountain ranges, with a few exceptions (such as the Teton Mountains in Wyoming and the Sawatch Range in Colorado). The highest peaks of the Rockies are found in Colorado, the tallest peak being Mount Elbert at 14,440 ft (4,400 m). In addition, instead of being one generally continuous and solid mountain range, it is broken up into a number of smaller, intermittent mountain ranges, forming a large series of basins and valleys.

West of the Rocky Mountains lies the Intermontane Plateaus (also known as the Intermountain West), a large, arid desert lying between the Rockies and the Cascades and Sierra Nevada ranges. The large southern portion, known as the Great Basin, consists of salt flats, drainage basins, and many small north–south mountain ranges. The Southwest is predominantly a low-lying desert region. A portion known as the Colorado Plateau, centered around the Four Corners region, is considered to have some of the most spectacular scenery in the world. It is accentuated in such national parks as Grand Canyon, Arches, Mesa Verde and Bryce Canyon, among others. Other smaller Intermontane areas include the Columbia Plateau covering eastern Washington, western Idaho and northeast Oregon and the Snake River Plain in Southern Idaho.

The Grand Canyon from Moran Point. The Grand Canyon is among the most famous locations in the country.

The Intermontane Plateaus come to an end at the Cascade Range and the Sierra Nevada. The Cascades consist of largely intermittent, volcanic mountains, many rising prominently from the surrounding landscape. The Sierra Nevada, further south, is a high, rugged, and dense mountain range. It contains the highest point in the contiguous 48 states, Mount Whitney (14,505 ft or 4,421 m). It is located at the boundary between California's Inyo and Tulare counties, just 84.6 mi or 136.2 km west-northwest of the lowest point in North America at the Badwater Basin in Death Valley National Park at 279 ft or 85 m below sea level.

These areas contain some spectacular scenery as well, as evidenced by such national parks as Yosemite and Mount Rainier. West of the Cascades and Sierra Nevada is a series of valleys, such as the Central Valley in California and the Willamette Valley in Oregon. Along the coast is a series of low mountain ranges known as the Pacific Coast Ranges.

Alaska contains some of the most dramatic scenery in the country. Tall, prominent mountain ranges rise up sharply from broad, flat tundra plains. On the islands off the south and southwest coast are many volcanoes. Hawaii, far to the south of Alaska in the Pacific Ocean, is a chain of tropical, volcanic islands, popular as a tourist destination for many from East Asia and the mainland United States.

The territories of Puerto Rico and the U.S. Virgin Islands encompass a number of tropical isles in the northeastern Caribbean Sea. In the Pacific Ocean the territories of Guam and the Northern Mariana Islands occupy the limestone and volcanic isles of the Mariana archipelago, and American Samoa (the only populated US territory in the southern hemisphere) encompasses volcanic peaks and coral atolls in the eastern part of the Samoan Islands chain.

Physiographic regions

A physiographical map of the contiguous 48 states of the U.S. The map indicates the age of the exposed surface as well as the type of terrain.

The geography of the United States varies across its immense area. Within the continental U.S., eight distinct physiographic divisions exist, though each is composed of several smaller physiographic subdivisions. These major divisions are:

Much of the central United States is covered by relatively flat, arable land. This aerial photo was taken over northern Ohio.

The Atlantic coast of the United States is low, with minor exceptions. The Appalachian Highland owes its oblique northeast–southwest trend to crustal deformations which in very early geological time gave a beginning to what later came to be the Appalachian Mountain system. This system had its climax of deformation so long ago (probably in Permian time) that it has since then been very generally reduced to moderate or low relief. It owes its present-day altitude either to renewed elevations along the earlier lines or to the survival of the most resistant rocks as residual mountains. The oblique trend of this coast would be even more pronounced but for a comparatively modern crustal movement, causing a depression in the northeast resulting in an encroachment of the sea upon the land. Additionally, the southeastern section has undergone an elevation resulting in the advance of the land upon the sea.

While the Atlantic coast is relatively low, the Pacific coast is, with few exceptions, hilly or mountainous. This coast has been defined chiefly by geologically recent crustal deformations, and hence still preserves a greater relief than that of the Atlantic. The low Atlantic coast and the hilly or mountainous Pacific coast foreshadow the leading features in the distribution of mountains within the United States.

The east coast Appalachian system, originally forest covered, is relatively low and narrow and is bordered on the southeast and south by an important coastal plain. The Cordilleran system on the western side of the continent is lofty, broad and complicated having two branches, the Rocky Mountain System and the Pacific Mountain System. In between these mountain systems lie the Intermontane Plateaus. Both the Columbia River and Colorado River rise far inland near the easternmost members of the Cordilleran system, and flow through plateaus and intermontane basins to the ocean. Heavy forests cover the northwest coast, but elsewhere trees are found only on the higher ranges below the Alpine region. The intermontane valleys, plateaus and basins range from treeless to desert with the most arid region being in the southwest.

The Laurentian Highlands, the Interior Plains and the Interior Highlands lie between the two coasts, stretching from the Gulf of Mexico northward, far beyond the national boundary, to the Arctic Ocean. The central plains are divided by a hardly perceptible height of land into a Canadian and a United States portion. It is from the United States side, that the great Mississippi system discharges southward to the Gulf of Mexico. The upper Mississippi and some of the Ohio basin is the semi-arid prairie region, with trees originally only along the watercourses. The uplands towards the Appalachians were included in the great eastern forested area, while the western part of the plains has an arid climate supporting only scanty native plant life, and in the south, it is practically barren.

Elevation extremes:

Climate

Köppen climate types of the US (including the 5 inhabited U.S. territories)
 
A map of average precipitation across the contiguous US.

Due to its large size and wide range of geographic features, the United States contains examples of nearly every global climate. The climate is subtropical in the Southern United States, continental in the north, tropical in Hawaii and southern Florida, polar in Alaska, semiarid in the Great Plains west of the 100th meridian, Mediterranean in coastal California and arid in the Great Basin and the Southwest. Its comparatively favorable agricultural climate contributed (in part) to the country's rise as a world power, with infrequent severe drought in the major agricultural regions, a general lack of widespread flooding, and a mainly temperate climate that receives adequate precipitation.

The main influence on U.S. weather is the polar jet stream which migrates northward into Canada in the summer months, and then southward into the US in the winter months. The jet stream brings in large low-pressure systems from the northern Pacific Ocean that enters the US mainland over the Pacific Northwest. The Cascade Range, Sierra Nevada, and Rocky Mountains pick up most of the moisture from these systems as they move eastward. Greatly diminished by the time they reach the High Plains, much of the moisture has been sapped by the orographic effect as it is forced over several mountain ranges.

Once it moves over the Great Plains, uninterrupted flat land allows it to reorganize and can lead to major clashes of air masses. In addition, moisture from the Gulf of Mexico is often drawn northward. When combined with a powerful jet stream, this can lead to violent thunderstorms, especially during spring and summer. Sometimes during winter, these storms can combine with another low-pressure system as they move up the East Coast and into the Atlantic Ocean, where they intensify rapidly. These storms are known as Nor'easters and often bring widespread, heavy rain, wind, and snowfall to New England. The uninterrupted grasslands of the Great Plains also lead to some of the most extreme climate swings in the world. Temperatures can rise or drop rapidly, winds can be extreme and the flow of heat waves or Arctic air masses often advance uninterrupted through the plains.

The Great Basin and Columbia Plateau (the Intermontane Plateaus) are arid or semiarid regions that lie in the rain shadow of the Cascades and Sierra Nevada. Precipitation averages less than 15 inches (38 cm). The Southwest is a hot desert, with temperatures exceeding 100 °F (37.8 °C) for several weeks at a time in summer. The Southwest and the Great Basin are also affected by the monsoon from the Gulf of California from July to September, which brings localized but often severe thunderstorms to the region.

Much of California consists of a Mediterranean climate, with sometimes excessive rainfall from October–April and nearly no rain the rest of the year. In the Pacific Northwest rain falls year-round but is much heavier during winter and spring. The mountains of the west receive abundant precipitation and very heavy snowfall. The Cascades are one of the snowiest places in the world, with some places averaging over 600 inches (1,524 cm) of snow annually, but the lower elevations closer to the coast receive very little snow.

Florida has a subtropical climate in the northern part of the state and a tropical climate in the southern part of the state. Summers are wet and winters are dry in Florida. Annually much of Florida, as well as the deep southern states, are frost-free. The mild winters of Florida allow a massive tropical fruit industry to thrive in the central part of the state, making the US second to only Brazil in citrus production in the world.

Another significant (but localized) weather effect is lake-effect snow that falls south and east of the Great Lakes, especially in the hilly portions of the Upper Peninsula of Michigan and on the Tug Hill Plateau in New York. The lake effect dumped well over 5 feet (1.52 m) of snow in the area of Buffalo, New York throughout the 2006–2007 winter. The Wasatch Front and Wasatch Range in Utah can also receive significant lake effect accumulations from the Great Salt Lake.

Extremes

In northern Alaska, tundra and arctic conditions predominate, where the temperature has fallen as low as −80 °F (−62.2 °C). On the other end of the spectrum, Death Valley, California once reached 134 °F (56.7 °C), the highest temperature ever recorded on Earth.

On average, the mountains of the western states receive the highest levels of snowfall on Earth. The greatest annual snowfall level is at Mount Rainier in Washington, at 692 inches (1,758 cm); the record there was 1,122 inches (2,850 cm) in the winter of 1971–72. This record was broken by the Mt. Baker Ski Area in northwestern Washington which reported 1,140 inches (2,896 cm) of snowfall for the 1998–99 snowfall season. Other places with significant snowfall outside the Cascade Range are the Wasatch Mountains in Utah, the San Juan Mountains in Colorado, and the Sierra Nevada in California.

Pago Pago Harbor in American Samoa has the highest annual rainfall of any harbor in the world.

In the east, the region near the Great Lakes and the mountain of the Northeast receives the most snowfall, although such snowfall levels do not near snowfall levels in the western United States. Along the northwestern Pacific coast, rainfall is greater than anywhere else in the continental U.S., with Quinault Rainforest in Washington having an average of 137 inches (348 cm). Hawaii receives even more, with 404 inches (1,026 cm) measured annually in the Big Bog, in Maui. Pago Pago Harbor in American Samoa is the rainiest harbor in the world (because of the 523 meter Rainmaker Mountain). The Mojave Desert, in the southwest, is home to the driest locale in the U.S. Yuma, Arizona, has an average of 2.63 inches (6.7 cm) of precipitation each year.

In central portions of the U.S., tornadoes are more common than anywhere else on Earth and touch down most commonly in the spring and summer. Deadly and destructive hurricanes occur almost every year along the Atlantic seaboard and the Gulf of Mexico. The Appalachian region and the Midwest experience the worst floods, though virtually no area in the U.S. is immune to flooding. The Southwest has the worst droughts; one is thought to have lasted over 500 years and to have hurt Ancestral Pueblo peoples. The West is affected by large wildfires each year.

Natural disasters

The United States is affected by a variety of natural disasters yearly. Although drought is rare, it has occasionally caused major disruption, such as during the Dust Bowl (1931–1942). Farmland failed throughout the Plains, entire regions were substantially depopulated, and dust storms ravaged the land.

A powerful tornado near Dimmitt, Texas on June 2, 1995.

Tornadoes and hurricanes

The Great Plains and Midwest, due to the contrasting air masses, see frequent severe thunderstorms and tornado outbreaks during spring and summer with around 1,000 tornadoes occurring each year. The strip of land from north Texas north to Kansas and Nebraska and east into Tennessee is known as Tornado Alley, where many houses have tornado shelters and many towns have tornado sirens due to the very frequent tornado formations in the region.

Hurricanes are another natural disaster found in the US, which can hit anywhere along the Gulf Coast or the Atlantic Coast as well as Hawaii in the Pacific Ocean. Particularly at risk are the central and southern Texas coasts, the area from southeastern Louisiana east to the Florida Panhandle, peninsular Florida, and the Outer Banks of North Carolina, although any portion of the coast could be struck. The U.S. territories and possessions in the Caribbean, such as Puerto Rico and the U.S. Virgin Islands, are also vulnerable to hurricanes due to their location in the Caribbean Sea.

Hurricane season runs from June 1 to November 30, with a peak from mid-August through early October. Some of the more devastating hurricanes have included the Galveston Hurricane of 1900, Hurricane Andrew in 1992, Hurricane Katrina in 2005, and Hurricane Harvey and Hurricane Maria in 2017.

Hurricanes (known as cyclones in the Pacific Ocean) fail to landfall on the Pacific Coast of the United States due to water temperatures being too cool to sustain them. However, the remnants of tropical cyclones from the Eastern Pacific occasionally impact the western United States, bringing moderate to heavy rainfall.

Total devastation in Gulfport, Mississippi caused by storm surge from Hurricane Katrina in 2005.

Flooding

Occasional severe flooding is experienced in the United States. Significant floods throughout history include the Great Mississippi Flood of 1927, the Great Flood of 1993, and widespread flooding and mudslides caused by the 1982–83 El Niño event in the western United States. Flooding is still prevalent, mostly on the Eastern Coast, during hurricanes or other inclement weather, for example in 2012, when Hurricane Sandy devastated the region. Localized flooding can, however, occur anywhere, and mudslides from heavy rain can cause problems in any mountainous area, particularly the Southwest. Large stretches of desert shrub in the west can fuel the spread of wildfires. The narrow canyons of many mountain areas in the west and severe thunderstorm activity during the summer lead to sometimes devastating flash floods as well, while nor'easter snowstorms can bring activity to a halt throughout the Northeast (although heavy snowstorms can occur almost anywhere).

Geologic

The West Coast of the continental United States makes up part of the Pacific Ring of Fire, an area of heavy tectonic and volcanic activity that is the source of 90% of the world's earthquakes. The American Northwest sees the highest concentration of active volcanoes in the United States, in Washington, Oregon and northern California along the Cascade Mountains. There are several active volcanoes located in the islands of Hawaii, including Kilauea in ongoing eruption since 1983, but they do not typically adversely affect the inhabitants of the islands. There has not been a major life-threatening eruption on the Hawaiian Islands since the 17th century. Volcanic eruptions can occasionally be devastating, such as in the 1980 eruption of Mount St. Helens in Washington.

The Ring of Fire makes California and southern Alaska particularly vulnerable to earthquakes. Earthquakes can cause extensive damage, such as the 1906 San Francisco earthquake or the 1964 Good Friday earthquake near Anchorage, Alaska. California is well known for seismic activity and requires large structures to be earthquake resistant to minimize loss of life and property. Outside of devastating earthquakes, California experiences minor earthquakes on a regular basis.

There have been about 100 significant earthquakes annually from 2010 to 2012. Past averages were 21 a year. This is believed to be due to the deep disposal of wastewater from fracking. None has exceeded a magnitude of 5.6, and no one has been killed.

Other natural disasters

Other natural disasters include tsunamis around the Pacific Basin, mudslides in California, and forest fires in the western half of the contiguous U.S. Although drought is relatively rare, it has occasionally caused major economic and social disruption, such as during the Dust Bowl (1931–1942), which resulted in widespread crop failures and dust storms, beginning in the southern Great Plains and reaching to the Atlantic Ocean.

Consequences

According to report by U.S. Census Bureau, in 2022 natural disasters led to the forced displacement of 3.3 million people, more than 1.3% of the U.S. adult population, with half of the displacements being caused by the hurricanes. The survey-report stated that in Florida, the devastation caused by Hurricanes Ian and Nicole resulted in the relocation of around 1 million people, or about one in every 17 adult residents. In Louisiana, where inhabitants were still dealing with the devastating results of Hurricane Ida the year before, more than 409,000 people, or almost one in every eight residents, were moved. Despite this, the Louisiana state saw a relatively calm hurricane season in 2022.

Public lands

Exclusive economic zones of the United States, including insular areas

The United States holds many areas for the use and enjoyment of the public. These include national parks, national monuments, national forests, wilderness areas, and other areas. For lists of areas, see the following articles:

Human

In terms of human geography, the United States is inhabited by a diverse set of ethnicities and cultures.

Western imperialism in Asia

From Wikipedia, the free encyclopedia
 
The influence and imperialism of Western Europe and associated states (such as Russia, Japan, and the United States) peaked in Asian territories from the colonial period beginning in the 16th century and substantially reducing with 20th century decolonization. It originated in the 15th-century search for trade routes to the Indian subcontinent and Southeast Asia that led directly to the Age of Discovery, and additionally the introduction of early modern warfare into what Europeans first called the East Indies and later the Far East. By the early 16th century, the Age of Sail greatly expanded Western European influence and development of the spice trade under colonialism. European-style colonial empires and imperialism operated in Asia throughout six centuries of colonialism, formally ending with the independence of the Portuguese Empire's last colony Macau in 1999. The empires introduced Western concepts of nation and the multinational state. This article attempts to outline the consequent development of the Western concept of the nation state.

European political power, commerce, and culture in Asia gave rise to growing trade in commodities—a key development in the rise of today's modern world free market economy. In the 16th century, the Portuguese broke the (overland) monopoly of the Arabs and Italians in trade between Asia and Europe by the discovery of the sea route to India around the Cape of Good Hope. The ensuing rise of the rival Dutch East India Company gradually eclipsed Portuguese influence in Asia.[note 1] Dutch forces first established independent bases in the East (most significantly Batavia, the heavily fortified headquarters of the Dutch East India Company) and then between 1640 and 1660 wrested Malacca, Ceylon, some southern Indian ports, and the lucrative Japan trade from the Portuguese. Later, the English and the French established settlements in India and trade with China and their acquisitions would gradually surpass those of the Dutch. Following the end of the Seven Years' War in 1763, the British eliminated French influence in India and established the British East India Company (founded in 1600) as the most important political force on the Indian subcontinent.

Before the Industrial Revolution in the mid-to-late 19th century, demand for oriental goods such as porcelain, silk, spices and tea remained the driving force behind European imperialism. The Western European stake in Asia remained confined largely to trading stations and strategic outposts necessary to protect trade. Industrialization, however, dramatically increased European demand for Asian raw materials; with the severe Long Depression of the 1870s provoking a scramble for new markets for European industrial products and financial services in Africa, the Americas, Eastern Europe, and especially in Asia. This scramble coincided with a new era in global colonial expansion known as "the New Imperialism", which saw a shift in focus from trade and indirect rule to formal colonial control of vast overseas territories ruled as political extensions of their mother countries. Between the 1870s and the beginning of World War I in 1914, the United Kingdom, France, and the Netherlands—the established colonial powers in Asia—added to their empires vast expanses of territory in the Middle East, the Indian Subcontinent, and Southeast Asia. In the same period, the Empire of Japan, following the Meiji Restoration; the German Empire, following the end of the Franco-Prussian War in 1871; Tsarist Russia; and the United States, following the Spanish–American War in 1898, quickly emerged as new imperial powers in East Asia and in the Pacific Ocean area.

In Asia, World War I and World War II were played out as struggles among several key imperial power, with conflicts involving the European powers along with Russia and the rising American and Japanese. None of the colonial powers, however, possessed the resources to withstand the strains of both World Wars and maintain their direct rule in Asia. Although nationalist movements throughout the colonial world led to the political independence of nearly all of Asia's remaining colonies, decolonization was intercepted by the Cold War. South East Asia, South Asia, the Middle East, and East Asia remained embedded in a world economic, financial, and military system in which the great powers compete to extend their influence. However, the rapid post-war economic development and rise of the industrialized developed countries of Taiwan, Singapore, South Korea, Japan and the developing countries of India, the People's Republic of China and its autonomous territory of Hong Kong, along with the collapse of the Soviet Union, have greatly diminished Western European influence in Asia. The United States remains influential with trade and military bases in Asia.

Early European exploration of Asia

European exploration of Asia started in ancient Roman times along the Silk Road. Knowledge of lands as distant as China were held by the Romans. Trade with India through the Roman Egyptian Red Sea ports was significant in the first centuries of the Common Era.

Medieval European exploration of Asia

Illustration of Marco Polo's arrival in a Chinese city

In the 13th and 14th centuries, a number of Europeans, many of them Christian missionaries, had sought to penetrate into China. The most famous of these travelers was Marco Polo. But these journeys had little permanent effect on east–west trade because of a series of political developments in Asia in the last decades of the 14th century, which put an end to further European exploration of Asia. The Yuan dynasty in China, which had been receptive to European missionaries and merchants, was overthrown, and the new Ming rulers were found to be unreceptive of religious proselytism. Meanwhile, the Turks consolidated control over the eastern Mediterranean, closing off key overland trade routes. Thus, until the 15th century, only minor trade and cultural exchanges between Europe and Asia continued at certain terminals controlled by Muslim traders.

Oceanic voyages to Asia

Western European rulers determined to find new trade routes of their own. The Portuguese spearheaded the drive to find oceanic routes that would provide cheaper and easier access to South and East Asian goods. This chartering of oceanic routes between East and West began with the unprecedented voyages of Portuguese and Spanish sea captains. Their voyages were influenced by medieval European adventurers, who had journeyed overland to the Far East and contributed to geographical knowledge of parts of Asia upon their return.

In 1488, Bartolomeu Dias rounded the southern tip of Africa under the sponsorship of Portugal's John II, from which point he noticed that the coast swung northeast (Cape of Good Hope). While Dias' crew forced him to turn back, by 1497, Portuguese navigator Vasco da Gama made the first open voyage from Europe to India. In 1520, Ferdinand Magellan, a Portuguese navigator in the service of the Crown of Castile ('Spain'), found a sea route into the Pacific Ocean.

Portuguese and Spanish trade and colonization in Asia

Portuguese monopoly over trade in the Indian Ocean and Asia

In 1509, the Portuguese under Francisco de Almeida won the decisive battle of Diu against a joint Mamluk and Arab fleet sent to expel the Portuguese of the Arabian Sea. The victory enabled Portugal to implement its strategy of controlling the Indian Ocean.

Early in the 16th century, Afonso de Albuquerque emerged as the Portuguese colonial viceroy most instrumental in consolidating Portugal's holdings in Africa and in Asia. He understood that Portugal could wrest commercial supremacy from the Arabs only by force, and therefore devised a plan to establish forts at strategic sites which would dominate the trade routes and also protect Portuguese interests on land. In 1510, he conquered Goa in India, which enabled him to gradually consolidate control of most of the commercial traffic between Europe and Asia, largely through trade; Europeans started to carry on trade from forts, acting as foreign merchants rather than as settlers. In contrast, early European expansion in the "West Indies", (later known to Europeans as a separate continent from Asia that they would call the "Americas") following the 1492 voyage of Christopher Columbus, involved heavy settlement in colonies that were treated as political extensions of the mother countries.

Lured by the potential of high profits from another expedition, the Portuguese established a permanent base in Cochin, south of the Indian trade port of Calicut in the early 16th century. In 1510, the Portuguese, led by Afonso de Albuquerque, seized Goa on the coast of India, which Portugal held until 1961, along with Diu and Daman (the remaining territory and enclaves in India from a former network of coastal towns and smaller fortified trading ports added and abandoned or lost centuries before). The Portuguese soon acquired a monopoly over trade in the Indian Ocean.

Portuguese viceroy Albuquerque (1509–1515) resolved to consolidate Portuguese holdings in Africa and Asia, and secure control of trade with the East Indies and China. His first objective was Malacca, which controlled the narrow strait through which most Far Eastern trade moved. Captured in 1511, Malacca became the springboard for further eastward penetration, starting with the voyage of António de Abreu and Francisco Serrão in 1512, ordered by Albuquerque, to the Moluccas. Years later the first trading posts were established in the Moluccas, or "Spice Islands", which was the source for some of the world's most hotly demanded spices, and from there, in Makassar and some others, but smaller, in the Lesser Sunda Islands. By 1513–1516, the first Portuguese ships had reached Canton on the southern coasts of China.

Portuguese expeditions 1415–1542: arrival places and dates; Portuguese spice trade routes in the Indian Ocean (blue); territories of the Portuguese empire under King John III rule (green)

In 1513, after the failed attempt to conquer Aden, Albuquerque entered with an armada, for the first time for Europeans by the ocean via, on the Red Sea; and in 1515, Albuquerque consolidated the Portuguese hegemony in the Persian Gulf gates, already begun by him in 1507, with the domain of Muscat and Ormuz. Shortly after, other fortified bases and forts were annexed and built along the Gulf, and in 1521, through a military campaign, the Portuguese annexed Bahrain.

The Portuguese conquest of Malacca triggered the Malayan–Portuguese war. In 1521, Ming dynasty China defeated the Portuguese at the Battle of Tunmen and then defeated the Portuguese again at the Battle of Xicaowan. The Portuguese tried to establish trade with China by illegally smuggling with the pirates on the offshore islands off the coast of Zhejiang and Fujian, but they were driven away by the Ming navy in the 1530s-1540s.

In 1557, China decided to lease Macau to the Portuguese as a place where they could dry goods they transported on their ships, which they held until 1999. The Portuguese, based at Goa and Malacca, had now established a lucrative maritime empire in the Indian Ocean meant to monopolize the spice trade. The Portuguese also began a channel of trade with the Japanese, becoming the first recorded Westerners to have visited Japan. This contact introduced Christianity and firearms into Japan.

In 1505, (also possibly before, in 1501), the Portuguese, through Lourenço de Almeida, the son of Francisco de Almeida, reached Ceylon. The Portuguese founded a fort at the city of Colombo in 1517 and gradually extended their control over the coastal areas and inland. In a series of military conflicts and political maneuvers, the Portuguese extended their control over the Sinhalese kingdoms, including Jaffna (1591), Raigama (1593), Sitawaka (1593), and Kotte (1594)- However, the aim of unifying the entire island under Portuguese control faced the Kingdom of Kandy`s fierce resistance. The Portuguese, led by Pedro Lopes de Sousa, launched a full-scale military invasion of the kingdom of Kandy in the Campaign of Danture of 1594. The invasion was a disaster for the Portuguese, with their entire army wiped out by Kandyan guerrilla warfare. Constantino de Sá, romantically celebrated in the 17th century Sinhalese Epic (also for its greater humanism and tolerance compared to other governors) led the last military operation that also ended in disaster. He died in the Battle of Randeniwela, refusing to abandon his troops in the face of total annihilation.

The energies of Castile (later, the unified Spain), the other major colonial power of the 16th century, were largely concentrated on the Americas, not South and East Asia, but the Spanish did establish a footing in the Far East in the Philippines. After fighting with the Portuguese by the Spice Islands since 1522 and the agreement between the two powers in 1529 (in the treaty of Zaragoza), the Spanish, led by Miguel López de Legazpi, settled and conquered gradually the Philippines since 1564. After the discovery of the return voyage to the Americas by Andres de Urdaneta in 1565, cargoes of Chinese goods were transported from the Philippines to Mexico and from there to Spain. By this long route, Spain reaped some of the profits of Far Eastern commerce. Spanish officials converted the islands to Christianity and established some settlements, permanently establishing the Philippines as the area of East Asia most oriented toward the West in terms of culture and commerce. The Moro Muslims fought against the Spanish for over three centuries in the Spanish–Moro conflict.

Decline of Portugal's Asian empire since the 17th century

The lucrative trade was vastly expanded when the Portuguese began to export slaves from Africa in 1541; however, over time, the rise of the slave trade left Portugal over-extended, and vulnerable to competition from other Western European powers. Envious of Portugal's control of trade routes, other Western European nations—mainly the Netherlands, France, and England—began to send in rival expeditions to Asia. In 1642, the Dutch drove the Portuguese out of the Gold Coast in Africa, the source of the bulk of Portuguese slave laborers, leaving this rich slaving area to other Europeans, especially the Dutch and the English.

Rival European powers began to make inroads in Asia as the Portuguese and Spanish trade in the Indian Ocean declined primarily because they had become hugely over-stretched financially due to the limitations on their investment capacity and contemporary naval technology. Both of these factors worked in tandem, making control over Indian Ocean trade extremely expensive.

The existing Portuguese interests in Asia proved sufficient to finance further colonial expansion and entrenchment in areas regarded as of greater strategic importance in Africa and Brazil. Portuguese maritime supremacy was lost to the Dutch in the 17th century, and with this came serious challenges for the Portuguese. However, they still clung to Macau and settled a new colony on the island of Timor. It was as recent as the 1960s and 1970s that the Portuguese began to relinquish their colonies in Asia. Goa was invaded by India in 1961 and became an Indian state in 1987; Portuguese Timor was abandoned in 1975 and was then invaded by Indonesia. It became an independent country in 2002, and Macau was handed back to the Chinese as per a treaty in 1999.

Holy wars

The arrival of the Portuguese and Spanish and their holy wars against Muslim states in the Malayan–Portuguese war, Spanish–Moro conflict and Castilian War inflamed religious tensions and turned Southeast Asia into an arena of conflict between Muslims and Christians. The Brunei Sultanate's capital at Kota Batu was assaulted by Governor Sande who led the 1578 Spanish attack.

The word "savages" in Spanish, cafres, was from the word "infidel" in Arabic - Kafir, and was used by the Spanish to refer to their own "Christian savages" who were arrested in Brunei. It was said Castilians are kafir, men who have no souls, who are condemned by fire when they die, and that too because they eat pork by the Brunei Sultan after the term accursed doctrine was used to attack Islam by the Spaniards which fed into hatred between Muslims and Christians sparked by their 1571 war against Brunei. The Sultan's words were in response to insults coming from the Spanish at Manila in 1578, other Muslims from Champa, Java, Borneo, Luzon, Pahang, Demak, Aceh, and the Malays echoed the rhetoric of holy war against the Spanish and Iberian Portuguese, calling them kafir enemies which was a contrast to their earlier nuanced views of the Portuguese in the Hikayat Tanah Hitu and Sejarah Melayu. The war by Spain against Brunei was defended in an apologia written by Doctor De Sande. The British eventually partitioned and took over Brunei while Sulu was attacked by the British, Americans, and Spanish which caused its breakdown and downfall after both of them thrived from 1500 to 1900 for four centuries. Dar al-Islam was seen as under invasion by "kafirs" by the Atjehnese led by Zayn al-din and by Muslims in the Philippines as they saw the Spanish invasion, since the Spanish brought the idea of a crusader holy war against Muslim Moros just as the Portuguese did in Indonesia and India against what they called "Moors" in their political and commercial conquests which they saw through the lens of religion in the 16th century.

In 1578, an attack was launched by the Spanish against Jolo, and in 1875 it was destroyed at their hands, and once again in 1974 it was destroyed by the Philippines. The Spanish first set foot on Borneo in Brunei.

The Spanish war against Brunei failed to conquer Brunei but it totally cut off the Philippines from Brunei's influence, the Spanish then started colonizing Mindanao and building fortresses. In response, the Bisayas, where Spanish forces were stationed, were subjected to retaliatory attacks by the Magindanao in 1599-1600 due to the Spanish attacks on Mindanao.

The Brunei royal family was related to the Muslim Rajahs who in ruled the principality in 1570 of Manila (Kingdom of Maynila) and this was what the Spaniards came across on their initial arrival to Manila, Spain uprooted Islam out of areas where it was shallow after they began to force Christianity on the Philippines in their conquests after 1521 while Islam was already widespread in the 16th century Philippines. In the Philippines in the Cebu islands the natives killed the Spanish fleet leader Magellan. Borneo's western coastal areas at Landak, Sukadana, and Sambas saw the growth of Muslim states in the sixteenth century, in the 15th century at Nanking, the capital of China, the death and burial of the Borneo Bruneian king Maharaja Kama took place upon his visit to China with Zheng He's fleet.

The Spanish were expelled from Brunei in 1579 after they attacked in 1578. There were fifty thousand inhabitants before the 1597 attack by the Spanish in Brunei.

During first contact with China, numerous aggressions and provocations were undertaken by the Portuguese. They believed they could mistreat the non-Christians because they themselves were Christians and acted in the name of their religion in committing crimes and atrocities. This resulted in the Battle of Xicaowan where the local Chinese navy defeated and captured a fleet of Portuguese caravels.

Dutch trade and colonization in Asia

Rise of Dutch control over Asian trade in the 17th century

Dutch settlement in the East Indies. Batavia (now Jakarta), Java, c. 1665.

The Portuguese decline in Asia was accelerated by attacks on their commercial empire by the Dutch and the English, which began a global struggle over the empire in Asia that lasted until the end of the Seven Years' War in 1763. The Netherlands revolt against Spanish rule facilitated Dutch encroachment on the Portuguese monopoly over South and East Asian trade. The Dutch looked on Spain's trade and colonies as potential spoils of war. When the two crowns of the Iberian peninsula were joined in 1581, the Dutch felt free to attack Portuguese territories in Asia.

By the 1590s, a number of Dutch companies were formed to finance trading expeditions in Asia. Because competition lowered their profits, and because of the doctrines of mercantilism, in 1602 the companies united into a cartel and formed the Dutch East India Company, and received from the government the right to trade and colonize territory in the area stretching from the Cape of Good Hope eastward to the Strait of Magellan.

In 1605, armed Dutch merchants captured the Portuguese fort at Amboyna in the Moluccas, which was developed into the company's first secure base. Over time, the Dutch gradually consolidated control over the great trading ports of the East Indies. This control allowed the company to monopolise the world spice trade for decades. Their monopoly over the spice trade became complete after they drove the Portuguese from Malacca in 1641 and Ceylon in 1658.

Colombo, Dutch Ceylon, based on an engraving of circa 1680

Dutch East India Company colonies or outposts were later established in Atjeh (Aceh), 1667; Macassar, 1669; and Bantam, 1682. The company established its headquarters at Batavia (today Jakarta) on the island of Java. Outside the East Indies, the Dutch East India Company colonies or outposts were also established in Persia (Iran), Bengal (now Bangladesh and part of India), Mauritius (1638-1658/1664-1710), Siam (now Thailand), Guangzhou (Canton, China), Taiwan (1624–1662), and southern India (1616–1795).

Ming dynasty China defeated the Dutch East India Company in the Sino-Dutch conflicts. The Chinese first defeated and drove the Dutch out of the Pescadores in 1624. The Ming navy under Zheng Zhilong defeated the Dutch East India Company's fleet at the 1633 Battle of Liaoluo Bay. In 1662, Zheng Zhilong's son Zheng Chenggong (also known as Koxinga) expelled the Dutch from Taiwan after defeating them in the siege of Fort Zeelandia. (see History of Taiwan) Further, the Dutch East India Company trade post on Dejima (1641–1857), an artificial island off the coast of Nagasaki, was for a long time the only place where Europeans could trade with Japan.

The Vietnamese Nguyễn lords defeated the Dutch in a naval battle in 1643.

The Cambodians defeated the Dutch in the Cambodian–Dutch War in 1644.

In 1652, Jan van Riebeeck established an outpost at the Cape of Good Hope (the southwestern tip of Africa, currently in South Africa) to restock company ships on their journey to East Asia. This post later became a fully-fledged colony, the Cape Colony (1652–1806). As Cape Colony attracted increasing Dutch and European settlement, the Dutch founded the city of Kaapstad (Cape Town).

By 1669, the Dutch East India Company was the richest private company in history, with a huge fleet of merchant ships and warships, tens of thousands of employees, a private army consisting of thousands of soldiers, and a reputation on the part of its stockholders for high dividend payments.

Dutch New Imperialism in Asia

The Dutch Governor-General, highest authority in the colony and the Sultan of Jogjakarta.

The company was in almost constant conflict with the English; relations were particularly tense following the Amboyna Massacre in 1623. During the 18th century, Dutch East India Company possessions were increasingly focused on the East Indies. After the fourth war between the United Provinces and England (1780–1784), the company suffered increasing financial difficulties. In 1799, the company was dissolved, commencing official colonisation of the East Indies. During the era of New Imperialism the territorial claims of the Dutch East India Company (VOC) expanded into a fully fledged colony named the Dutch East Indies. Partly driven by re-newed colonial aspirations of fellow European nation states the Dutch strived to establish unchallenged control of the archipelago now known as Indonesia.

Six years into formal colonisation of the East Indies, in Europe the Dutch Republic was occupied by the French forces of Napoleon. The Dutch government went into exile in England and formally ceded its colonial possessions to Great Britain. The pro-French Governor General of Java Jan Willem Janssens, resisted a British invasion force in 1811 until forced to surrender. British Governor Raffles, who the later founded the city of Singapore, ruled the colony the following 10 years of the British interregnum (1806–1816).

After the defeat of Napoleon and the Anglo-Dutch Treaty of 1814 colonial government of the East Indies was ceded back to the Dutch in 1817. The loss of South Africa and the continued scramble for Africa stimulated the Dutch to secure unchallenged dominion over its colony in the East Indies. The Dutch started to consolidate its power base through extensive military campaigns and elaborate diplomatic alliances with indigenous rulers ensuring the Dutch tricolor was firmly planted in all corners of the Archipelago. These military campaigns included: the Padri War (1821–1837), the Java War (1825–1830) and the Aceh War (1873–1904). This raised the need for a considerable military buildup of the colonial army (KNIL). From all over Europe soldiers were recruited to join the KNIL.

The Dutch concentrated their colonial enterprise in the Dutch East Indies (Indonesia) throughout the 19th century. The Dutch lost control over the East Indies to the Japanese during much of World War II. Following the war, the Dutch fought Indonesian independence forces after Japan surrendered to the Allies in 1945. In 1949, most of what was known as the Dutch East Indies was ceded to the independent Republic of Indonesia. In 1962, also Dutch New Guinea was annexed by Indonesia de facto ending Dutch imperialism in Asia.

British in India

Portuguese, French, and British competition in India (1600–1763)

Robert Clive, 1st Baron Clive

The English sought to stake out claims in India at the expense of the Portuguese dating back to the Elizabethan era. In 1600, Queen Elizabeth I incorporated the English East India Company (later the British East India Company), granting it a monopoly of trade from the Cape of Good Hope eastward to the Strait of Magellan. In 1639, it acquired Madras on the east coast of India, where it quickly surpassed Portuguese Goa as the principal European trading centre on the Indian Subcontinent.

Through bribes, diplomacy, and manipulation of weak native rulers, the company prospered in India, where it became the most powerful political force, and outrivaled its Portuguese and French competitors. For more than one hundred years, English and French trading companies had fought one another for supremacy, and, by the middle of the 18th century, competition between the British and the French had heated up. French defeat by the British under the command of Robert Clive during the Seven Years' War (1756–1763) marked the end of the French stake in India.

Collapse of Mughal India

The British East India Company, although still in direct competition with French and Dutch interests until 1763, was able to extend its control over almost the whole of India in the century following the subjugation of Bengal at the 1757 Battle of Plassey. The British East India Company made great advances at the expense of the Mughal Empire.

The reign of Aurangzeb had marked the height of Mughal power. By 1690 Mughal territorial expansion reached its greatest extent encompassing the entire Indian Subcontinent. But this period of power was followed by one of decline. Fifty years after the death of Aurangzeb, the great Mughal empire had crumbled. Meanwhile, marauding warlords, nobles, and others bent on gaining power left the Subcontinent increasingly anarchic. Although the Mughals kept the imperial title until 1858, the central government had collapsed, creating a power vacuum.

From Company to Crown

The British Empire in 1920

Aside from defeating the French during the Seven Years' War, Robert Clive, the leader of the Company in India, defeated Siraj ud-Daulah, a key Indian ruler of Bengal, at the decisive Battle of Plassey (1757), a victory that ushered in the beginning of a new period in Indian history, that of informal British rule. While still nominally the sovereign, the Mughal Indian emperor became more and more of a puppet ruler, and anarchy spread until the company stepped into the role of policeman of India. The transition to formal imperialism, characterised by Queen Victoria being crowned "Empress of India" in the 1870s was a gradual process. The first step toward cementing formal British control extended back to the late 18th century. The British Parliament, disturbed by the idea that a great business concern, interested primarily in profit, was controlling the destinies of millions of people, passed acts in 1773 and 1784 that gave itself the power to control company policies and to appoint the highest company official in India, the Governor-General. (This system of dual control lasted until 1858.) By 1818, the East India Company was master of all of India. Some local rulers were forced to accept its overlordship; others were deprived of their territories. Some portions of India were administered by the British directly; in others native dynasties were retained under British supervision.

Until 1858, however, much of India was still officially the dominion of the Mughal emperor. Anger among some social groups, however, was seething under the governor-generalship of James Dalhousie (1847–1856), who annexed the Punjab (1849) after victory in the Second Sikh War, annexed seven princely states using the doctrine of lapse, annexed the key state of Oudh on the basis of misgovernment, and upset cultural sensibilities by banning Hindu practices such as sati.

The 1857 Indian Rebellion, an uprising initiated by Indian troops, called sepoys, who formed the bulk of the company's armed forces, was the key turning point. Rumour had spread among them that their bullet cartridges were lubricated with pig and cow fat. The cartridges had to be bit open, so this upset the Hindu and Muslim soldiers. The Hindu religion held cows sacred, and for Muslims pork was considered haraam. In one camp, 85 out of 90 sepoys would not accept the cartridges from their garrison officer. The British harshly punished those who would not by jailing them. The Indian people were outraged, and on May 10, 1857, sepoys marched to Delhi, and, with the help of soldiers stationed there, captured it. Fortunately for the British, many areas remained loyal and quiescent, allowing the revolt to be crushed after fierce fighting. One important consequence of the revolt was the final collapse of the Mughal dynasty. The mutiny also ended the system of dual control under which the British government and the British East India Company shared authority. The government relieved the company of its political responsibilities, and in 1858, after 258 years of existence, the company relinquished its role. Trained civil servants were recruited from graduates of British universities, and these men set out to rule India. Lord Canning (created earl in 1859), appointed Governor-General of India in 1856, became known as "Clemency Canning" as a term of derision for his efforts to restrain revenge against the Indians during the Indian Mutiny. When the Government of India was transferred from the company to the Crown, Canning became the first viceroy of India.

The Company initiated the first of the Anglo-Burmese Wars in 1824, which led to total annexation of Burma by the Crown in 1885. The British ruled Burma as a province of British India until 1937, then administered her separately under the Burma Office except during the Japanese occupation of Burma, 1942–1945, until granted independence on 4 January 1948. (Unlike India, Burma opted not to join the Commonwealth of Nations.)

Rise of Indian nationalism

The denial of equal status to Indians was the immediate stimulus for the formation in 1885 of the Indian National Congress, initially loyal to the Empire but committed from 1905 to increased self-government and by 1930 to outright independence. The "Home charges", payments transferred from India for administrative costs, were a lasting source of nationalist grievance, though the flow declined in relative importance over the decades to independence in 1947.

Although majority Hindu and minority Muslim political leaders were able to collaborate closely in their criticism of British policy into the 1920s, British support for a distinct Muslim political organisation, the Muslim League from 1906 and insistence from the 1920s on separate electorates for religious minorities, is seen by many in India as having contributed to Hindu-Muslim discord and the country's eventual Partition.

France in Indochina

The capture of Lạng Sơn in 1885

France, which had lost its empire to the British by the end of the 18th century, had little geographical or commercial basis for expansion in Southeast Asia. After the 1850s, French imperialism was initially impelled by a nationalistic need to rival the United Kingdom and was supported intellectually by the notion that French culture was superior to that of the people of Annam (Vietnam), and its mission civilisatrice—or its "civilizing mission" of the Annamese through their assimilation to French culture and the Catholic religion. The pretext for French expansionism in Indochina was the protection of French religious missions in the area, coupled with a desire to find a southern route to China through Tonkin, the European name for a region of northern Vietnam.

French religious and commercial interests were established in Indochina as early as the 17th century, but no concerted effort at stabilizing the French position was possible in the face of British strength in the Indian Ocean and French defeat in Europe at the beginning of the 19th century. A mid-19th century religious revival under the Second Empire provided the atmosphere within which interest in Indochina grew. Anti-Christian persecutions in the Far East provided the pretext for the bombardment of Tourane (Danang) in 1847, and invasion and occupation of Danang in 1857 and Saigon in 1858. Under Napoleon III, France decided that French trade with China would be surpassed by the British, and accordingly the French joined the British against China in the Second Opium War from 1857 to 1860, and occupied parts of Vietnam as its gateway to China.

By the Treaty of Saigon in 1862, on June 5, the Vietnamese emperor ceded France three provinces of southern Vietnam to form the French colony of Cochinchina; France also secured trade and religious privileges in the rest of Vietnam and a protectorate over Vietnam's foreign relations. Gradually French power spread through exploration, the establishment of protectorates, and outright annexations. Their seizure of Hanoi in 1882 led directly to war with China (1883–1885), and the French victory confirmed French supremacy in the region. France governed Cochinchina as a direct colony, and central and northern Vietnam under the protectorates of Annam and Tonkin, and Cambodia as protectorates in one degree or another. Laos too was soon brought under French "protection".

By the beginning of the 20th century, France had created an empire in Indochina nearly 50 percent larger than the mother country. A Governor-General in Hanoi ruled Cochinchina directly and the other regions through a system of residents. Theoretically, the French maintained the precolonial rulers and administrative structures in Annam, Tonkin, Cochinchina, Cambodia, and Laos, but in fact the governor-generalship was a centralised fiscal and administrative regime ruling the entire region. Although the surviving native institutions were preserved in order to make French rule more acceptable, they were almost completely deprived of any independence of action. The ethnocentric French colonial administrators sought to assimilate the upper classes into France's "superior culture." While the French improved public services and provided commercial stability, the native standard of living declined and precolonial social structures eroded. Indochina, which had a population of over eighteen million in 1914, was important to France for its tin, pepper, coal, cotton, and rice. It is still a matter of debate, however, whether the colony was commercially profitable.

Russia and "The Great Game"

Russian troops taking Samarkand in 1868.

Tsarist Russia is not often regarded as a colonial power such as the United Kingdom or France because of the manner of Russian expansions: unlike the United Kingdom, which expanded overseas, the Russian Empire grew from the centre outward by a process of accretion, like the United States. In the 19th century, Russian expansion took the form of a struggle of an effectively landlocked country for access to a warm-water port.

Historian Michael Khodarkovsky describes Tsarist Russia as a "hybrid empire" that combined elements of continental and colonial empires.

While the British were consolidating their hold on India, Russian expansion had moved steadily eastward to the Pacific, then toward the Caucasus and Central Asia. In the early 19th century, it succeeded in conquering the South Caucasus and Dagestan from Qajar Iran following the Russo-Persian War (1804–1813), the Russo-Persian War (1826–1828) and the out coming treaties of Gulistan and Turkmenchay, giving Russia direct borders with both Persia's as well as Ottoman Turkey's heartlands. Later, they eventually reached the frontiers of Afghanistan as well (which had the largest foreign border adjacent to British holdings in India). In response to Russian expansion, the defense of India's land frontiers and the control of all sea approaches to the subcontinent via the Suez Canal, the Red Sea, and the Persian Gulf became preoccupations of British foreign policy in the 19th century. This was called the Great Game.

According to Kazakh scholar Kereihan Amanzholov, Russian colonialism had "no essential difference with the colonialist policies of Britain, France, and other European powers".

Anglo-Russian rivalry in the Middle East and Central Asia led to a brief confrontation over Afghanistan in the 1870s. In Persian, both nations set up banks to extend their economic influence. The United Kingdom went so far as to invade Tibet, a land subordinate to the Chinese Qing Empire, in 1904, but withdrew when it became clear that Russian influence was insignificant and when Chinese and Tibetan resistance proved tougher than expected.

Qing China defeated Russia in the early Sino-Russian border conflicts, although the Russian Empire later acquired Outer Manchuria in the Amur Annexation. During the Boxer Rebellion, the Russian Empire invaded Manchuria in 1900, and the Blagoveshchensk massacre occurred against Chinese residents on the Russian side of the border.

In 1907, the United Kingdom and Russia signed an agreement that, on the surface, ended their rivalry in Central Asia. (see Anglo-Russian Convention) As part of the entente, Russia agreed to deal with the sovereign of Afghanistan only through British intermediaries. In turn, the United Kingdom would not annex or occupy Afghanistan. Chinese suzerainty over Tibet also was recognised by both Russia and the United Kingdom, since nominal control by a weak China was preferable to control by either power. Persia was divided into Russian and British spheres of influence and an intervening "neutral" zone. The United Kingdom and Russia chose to reach these uneasy compromises because of growing concern on the part of both powers over German expansion in strategic areas of China and Africa.

Following the entente, Russia increasingly intervened in Persian domestic politics and suppressed nationalist movements that threatened both Saint Petersburg and London. After the Russian Revolution, Russia gave up its claim to a sphere of influence, though Soviet involvement persisted alongside the United Kingdom's until the 1940s.

In the Middle East, in Persia and the Ottoman Empire, a German company built a railroad from Constantinople to Baghdad and the Persian Gulf in the latter, while it built a railroad from the north of the country to the south, connecting the Caucasus with the Persian Gulf in the former. Germany wanted to gain economic influence in the region and then, perhaps, move on to India. This was met with bitter resistance by the United Kingdom, Russia, and France who divided the region among themselves.

Western European and Russian intrusions into China

A shocked Mandarin in Manchu robe in the back watching Queen Victoria (Britain), Kaiser Wilhelm II (Germany), Tsar Nicholas II (Russia), Marianne (France), and a samurai (Japan) cutting up a cake with Chine ("China" in French) written on it.
 

The 16th century brought many Jesuit missionaries to China, such as Matteo Ricci, who established missions where Western science was introduced, and where Europeans gathered knowledge of Chinese society, history, culture, and science. During the 18th century, merchants from Western Europe came to China in increasing numbers. However, merchants were confined to Guangzhou and the Portuguese colony of Macau, as they had been since the 16th century. European traders were increasingly irritated by what they saw as the relatively high customs duties they had to pay and by the attempts to curb the growing import trade in opium. By 1800, its importation was forbidden by the imperial government. However, the opium trade continued to boom.

Early in the 19th century, serious internal weaknesses developed in the Qing dynasty that left China vulnerable to Western, Meiji period Japanese, and Russian imperialism. In 1839, China found itself fighting the First Opium War with Britain. China was defeated, and in 1842, signed the provisions of the Treaty of Nanking which were first of the unequal treaties signed during the Qing Dynasty. Hong Kong Island was ceded to Britain, and certain ports, including Shanghai and Guangzhou, were opened to British trade and residence. In 1856, the Second Opium War broke out. The Chinese were again defeated, and now forced to the terms of the 1858 Treaty of Tientsin. The treaty opened new ports to trade and allowed foreigners to travel in the interior. In addition, Christians gained the right to propagate their religion. The United States Treaty of Wanghia and Russia later obtained the same prerogatives in separate treaties.

Toward the end of the 19th century, China appeared on the way to territorial dismemberment and economic vassalage—the fate of India's rulers that played out much earlier. Several provisions of these treaties caused long-standing bitterness and humiliation among the Chinese: extraterritoriality (meaning that in a dispute with a Chinese person, a Westerner had the right to be tried in a court under the laws of his own country), customs regulation, and the right to station foreign warships in Chinese waters, including its navigable rivers.

Jane E. Elliott criticized the allegation that China refused to modernize or was unable to defeat Western armies as simplistic, noting that China embarked on a massive military modernization in the late 1800s after several defeats, buying weapons from Western countries and manufacturing their own at arsenals, such as the Hanyang Arsenal during the Boxer Rebellion. In addition, Elliott questioned the claim that Chinese society was traumatized by the Western victories, as many Chinese peasants (90% of the population at that time) living outside the concessions continued about their daily lives, uninterrupted and without any feeling of "humiliation".

Historians have judged the Qing dynasty's vulnerability and weakness to foreign imperialism in the 19th century to be based mainly on its maritime naval weakness while it achieved military success against westerners on land, the historian Edward L. Dreyer said that "China’s nineteenth-century humiliations were strongly related to her weakness and failure at sea. At the start of the Opium War, China had no unified navy and no sense of how vulnerable she was to attack from the sea; British forces sailed and steamed wherever they wanted to go......In the Arrow War (1856-1860), the Chinese had no way to prevent the Anglo-French expedition of 1860 from sailing into the Gulf of Zhili and landing as near as possible to Beijing. Meanwhile, new but not exactly modern Chinese armies suppressed the midcentury rebellions, bluffed Russia into a peaceful settlement of disputed frontiers in Central Asia, and defeated the French forces on land in the Sino-French War (1884-1885). But the defeat of the fleet, and the resulting threat to steamship traffic to Taiwan, forced China to conclude peace on unfavorable terms."

During the Sino-French War, Vietnamese forces defeated the French at the Battle of Cầu Giấy (Paper Bridge), Bắc Lệ ambush, Battle of Phu Lam Tao, Battle of Zhenhai, the Battle of Tamsui in the Keelung Campaign and in the last battle which ended the war, the Battle of Bang Bo (Zhennan Pass), which triggered the French Retreat from Lạng Sơn and resulted in the collapse of the French Jules Ferry government in the Tonkin Affair.

The Qing dynasty forced Russia to hand over disputed territory in Ili in the Treaty of Saint Petersburg (1881), in what was widely seen by the west as a diplomatic victory for the Qing. Russia acknowledged that Qing China potentially posed a serious military threat. Mass media in the west during this era portrayed China as a rising military power due to its modernization programs and as a major threat to the western world, invoking fears that China would successfully conquer western colonies like Australia.

The British observer Demetrius Charles de Kavanagh Boulger suggested a British-Chinese alliance to check Russian expansion in Central Asia.

During the Ili crisis when Qing China threatened to go to war against Russia over the Russian occupation of Ili, the British officer Charles George Gordon was sent to China by Britain to advise China on military options against Russia should a potential war break out between China and Russia.

The Russians observed the Chinese building up their arsenal of modern weapons during the Ili crisis, the Chinese bought thousands of rifles from Germany. In 1880, massive amounts of military equipment and rifles were shipped via boats to China from Antwerp as China purchased torpedoes, artillery, and 260,260 modern rifles from Europe.

The Russian military observer D. V. Putiatia visited China in 1888 and found that in Northeastern China (Manchuria) along the Chinese-Russian border, the Chinese soldiers were potentially able to become adept at "European tactics" under certain circumstances, and the Chinese soldiers were armed with modern weapons like Krupp artillery, Winchester carbines, and Mauser rifles.

Compared to Russian controlled areas, more benefits were given to the Muslim Kirghiz on the Chinese controlled areas. Russian settlers fought against the Muslim nomadic Kirghiz, which led the Russians to believe that the Kirghiz would be a liability in any conflict against China. The Muslim Kirghiz were sure that in an upcoming war, that China would defeat Russia.

Russian sinologists, the Russian media, threat of internal rebellion, the pariah status inflicted by the Congress of Berlin, the negative state of the Russian economy all led Russia to concede and negotiate with China in St Petersburg, and return most of Ili to China.

Japanese illustration depicting the beheading of Chinese captives. First Sino-Japanese War of 1894–5

The rise of Japan since the Meiji Restoration as an imperial power led to further subjugation of China. In a dispute over China's longstanding claim of suzerainty in Korea, war broke out between China and Japan, resulting in humiliating defeat for the Chinese. By the Treaty of Shimonoseki (1895), China was forced to recognize effective Japanese rule of Korea and Taiwan was ceded to Japan until its recovery in 1945 at the end of the WWII by the Republic of China.

China's defeat at the hands of Japan was another trigger for future aggressive actions by Western powers. In 1897, Germany demanded and was given a set of exclusive mining and railroad rights in Shandong province. Russia obtained access to Dairen and Port Arthur and the right to build a railroad across Manchuria, thereby achieving complete domination over a large portion of northwestern China. The United Kingdom and France also received a number of concessions. At this time, much of China was divided up into "spheres of influence": Germany had influence in Jiaozhou (Kiaochow) Bay, Shandong, and the Yellow River valley; Russia had influence in the Liaodong Peninsula and Manchuria; the United Kingdom had influence in Weihaiwei and the Yangtze Valley; and France had influence in the Guangzhou Bay and the provinces of Yunnan, Guizhou and Guangxi

British and Japanese forces engage Boxers in battle, 1900

China continued to be divided up into these spheres until the United States, which had no sphere of influence, grew alarmed at the possibility of its businessmen being excluded from Chinese markets. In 1899, Secretary of State John Hay asked the major powers to agree to a policy of equal trading privileges. In 1900, several powers agreed to the U.S.-backed scheme, giving rise to the "Open Door" policy, denoting freedom of commercial access and non-annexation of Chinese territory. In any event, it was in the European powers' interest to have a weak but independent Chinese government. The privileges of the Europeans in China were guaranteed in the form of treaties with the Qing government. In the event that the Qing government totally collapsed, each power risked losing the privileges that it already had negotiated.

The erosion of Chinese sovereignty and seizures of land from Chinese by foreigners contributed to a spectacular anti-foreign outbreak in June 1900, when the "Boxers" (properly the society of the "righteous and harmonious fists") attacked foreigners around Beijing. The Imperial Court was divided into anti-foreign and pro-foreign factions, with the pro-foreign faction led by Ronglu and Prince Qing hampering any military effort by the anti-foreign faction led by Prince Duan and Dong Fuxiang. The Qing Empress Dowager ordered all diplomatic ties to be cut off and all foreigners to leave the legations in Beijing to go to Tianjin. The foreigners refused to leave. Fueled by entirely false reports that the foreigners in the legations were massacred, the Eight-Nation Alliance decided to launch an expedition on Beijing to reach the legations but they underestimated the Qing military. The Qing and Boxers defeated the foreigners at the Seymour Expedition, forcing them to turn back at the Battle of Langfang. In response to the foreign attack on the Taku Forts the Qing responded by declaring war against the foreigners. the Qing forces and foreigners fought a fierce battle at the Battle of Tientsin before the foreigners could launch a second expedition. On their second try Gaselee Expedition, with a much larger force, the foreigners managed to reach Beijing and fight the Battle of Peking. British and French forces looted, plundered and burned the Old Summer Palace to the ground for the second time (the first time being in 1860, following the Second Opium War). German forces were particularly severe in exacting revenge for the killing of their ambassador due to the orders of Kaiser Wilhelm II, who held anti-Asian sentiments, while Russia tightened its hold on Manchuria in the northeast until its crushing defeat by Japan in the war of 1904–1905. The Qing court evacuated to Xi'an and threatened to continue the war against foreigners, until the foreigners tempered their demands in the Boxer Protocol, promising that China would not have to give up any land and gave up the demands for the execution of Dong Fuxiang and Prince Duan.

The correspondent Douglas Story observed Chinese troops in 1907 and praised their abilities and military skill.

Extraterritorial jurisdiction was abandoned by the United Kingdom and the United States in 1943. Chiang Kai-shek forced the French to hand over all their concessions back to China control after World War II. Foreign political control over leased parts of China ended with the incorporation of Hong Kong and the small Portuguese territory of Macau into the People's Republic of China in 1997 and 1999 respectively.

U.S. imperialism in Asia

One of the New York Journal's most infamous cartoons, depicting Philippine–American War General Jacob H. Smith's order "Kill Everyone over Ten", from the front page on May 5, 1902.

Some Americans in the 19th century advocated for the annexation of Taiwan from China. Taiwanese aborigines often attacked and massacred shipwrecked western sailors. In 1867, during the Rover incident, Taiwanese aborigines attacked shipwrecked American sailors, killing the entire crew. They subsequently defeated a retaliatory expedition by the American military and killed another American during the battle.

As the United States emerged as a new imperial power in the Pacific and Asia, one of the two oldest Western imperialist powers in the regions, Spain, was finding it increasingly difficult to maintain control of territories it had held in the regions since the 16th century. In 1896, a widespread revolt against Spanish rule broke out in the Philippines. Meanwhile, the recent string of U.S. territorial gains in the Pacific posed an even greater threat to Spain's remaining colonial holdings.

As the U.S. continued to expand its economic and military power in the Pacific, it declared war against Spain in 1898. During the Spanish–American War, U.S. Admiral Dewey destroyed the Spanish fleet at Manila and U.S. troops landed in the Philippines. Spain later agreed by treaty to cede the Philippines in Asia and Guam in the Pacific. In the Caribbean, Spain ceded Puerto Rico to the U.S. The war also marked the end of Spanish rule in Cuba, which was to be granted nominal independence but remained heavily influenced by the U.S. government and U.S. business interests. One year following its treaty with Spain, the U.S. occupied the small Pacific outpost of Wake Island.

The Filipinos, who assisted U.S. troops in fighting the Spanish, wished to establish an independent state and, on June 12, 1898, declared independence from Spain. In 1899, fighting between the Filipino nationalists and the U.S. broke out; it took the U.S. almost fifteen years to fully subdue the insurgency. The U.S. sent 70,000 troops and suffered thousands of casualties. The Filipinos insurgents, however, suffered considerably higher casualties than the Americans. Most casualties in the war were civilians dying primarily from disease and famine.

U.S. counter-insurgency operations in rural areas often included scorched earth tactics which involved burning down villages and concentrating civilians into camps known as "protected zones". The execution of U.S. soldiers taken prisoner by the Filipinos led to disproportionate reprisals by American forces.

The Moro Muslims fought against the Americans in the Moro Rebellion.

In 1914, Dean C. Worcester, U.S. Secretary of the Interior for the Philippines (1901–1913) described "the regime of civilisation and improvement which started with American occupation and resulted in developing naked savages into cultivated and educated men". Nevertheless, some Americans, such as Mark Twain, deeply opposed American involvement/imperialism in the Philippines, leading to the abandonment of attempts to construct a permanent U.S. naval base and using it as an entry point to the Chinese market. In 1916, Congress guaranteed the independence of the Philippines by 1945.

World War I: Changes in Imperialism

World War I brought about the fall of several empires in Europe. This had repercussions around the world. The defeated Central Powers included Germany and the Turkish Ottoman Empire. Germany lost all of its colonies in Asia. German New Guinea, a part of Papua New Guinea, became administered by Australia. German possessions and concessions in China, including Qingdao, became the subject of a controversy during the Paris Peace Conference when the Beiyang government in China agreed to cede these interests to Japan, to the anger of many Chinese people. Although the Chinese diplomats refused to sign the agreement, these interests were ceded to Japan with the support of the United States and the United Kingdom.

Turkey gave up her provinces; Syria, Palestine, and Mesopotamia (now Iraq) came under French and British control as League of Nations Mandates. The discovery of petroleum first in Iran and then in the Arab lands in the interbellum provided a new focus for activity on the part of the United Kingdom, France, and the United States.

Japan

Europeans in Dejima, the Dutch trading colony in the harbor of Nagasaki, early 19th century.

In 1641, all Westerners were thrown out of Japan. For the next two centuries, Japan was free from Western contact, except for at the port of Nagasaki, which Japan allowed Dutch merchant vessels to enter on a limited basis.

Japan's freedom from Western contact ended on 8 July 1853, when Commodore Matthew Perry of the U.S. Navy sailed a squadron of black-hulled warships into Edo (modern Tokyo) harbor. The Japanese told Perry to sail to Nagasaki but he refused. Perry sought to present a letter from U.S. President Millard Fillmore to the emperor which demanded concessions from Japan. Japanese authorities responded by stating that they could not present the letter directly to the emperor, but scheduled a meeting on 14 July with a representative of the emperor. On 14 July, the squadron sailed towards the shore, giving a demonstration of their cannon's firepower thirteen times. Perry landed with a large detachment of Marines and presented the emperor's representative with Fillmore's letter. Perry said he would return, and did so, this time with even more war ships. The U.S. show of force led to Japan's concession to the Convention of Kanagawa on 31 March 1854. This treaty conferred extraterritoriality on American nationals, as well as, opening up further treaty ports beyond Nagasaki. This treaty was followed up by similar treaties with the United Kingdom, the Netherlands, Russia and France. These events made Japanese authorities aware that the country was lacking technologically and needed the strength of industrialism in order to keep their power. This realisation eventually led to a civil war and political reform known the Meiji Restoration.

The Japanese Empire in 1939

The Meiji Restoration of 1868 led to administrative overhaul, deflation and subsequent rapid economic development. Japan had limited natural resources of her own and sought both overseas markets and sources of raw materials, fuelling a drive for imperial conquest which began with the defeat of China in 1895.

Taiwan, ceded by Qing dynasty China, became the first Japanese colony. In 1899, Japan won agreements from the great powers' to abandon extraterritoriality for their citizens, and an alliance with the United Kingdom established it in 1902 as an international power. Its spectacular defeat of Russia's navy in 1905 gave it the southern half of the island of Sakhalin; exclusive Japanese influence over Korea (propinquity); the former Russian lease of the Liaodong Peninsula with Port Arthur (Lüshunkou); and extensive rights in Manchuria (see the Russo-Japanese War).

Three Koreans shot for pulling up rails as a protest against seizure of land without payment by Japanese.

The Empire of Japan and the Joseon Dynasty in Korea formed bilateral diplomatic relations in 1876. China lost its suzerainty of Korea after defeat in the Sino-Japanese War in 1894. Russia also lost influence on the Korean peninsula with the Treaty of Portsmouth as a result of the Russo-Japanese war in 1904. The Joseon Dynasty became increasingly dependent on Japan. Korea became a protectorate of Japan with the Japan–Korea Treaty of 1905. Korea was then de jure annexed to Japan with the Japan–Korea Treaty of 1910.

Japan was now one of the most powerful forces in the Far East, and in 1914, it entered World War I on the side of the Allies, seizing German-occupied Kiaochow and subsequently demanding Chinese acceptance of Japanese political influence and territorial acquisitions (Twenty-One Demands, 1915). Mass protests in Peking in 1919 which sparked widespread Chinese nationalism, coupled with Allied (and particularly U.S.) opinion led to Japan's abandonment of most of the demands and Kiaochow's 1922 return to China. Japan received the German territory from the Treaty of Versailles.

Tensions with China increased over the 1920s, and in 1931 Japanese Kwantung Army based in Manchuria seized control of the region without admission from Tokyo. Intermittent conflict with China led to full-scale war in mid-1937, drawing Japan toward an overambitious bid for Asian hegemony (Greater East Asia Co-Prosperity Sphere), which ultimately led to defeat and the loss of all its overseas territories after World War II (see Japanese expansionism and Japanese nationalism).

After World War II

Decolonisation and the rise of nationalism in Asia

In the aftermath of World War II, European colonies, controlling more than one billion people throughout the world, still ruled most of the Middle East, South East Asia, and the Indian Subcontinent. However, the image of European pre-eminence was shattered by the wartime Japanese occupations of large portions of British, French, and Dutch territories in the Pacific. The destabilisation of European rule led to the rapid growth of nationalist movements in Asia—especially in Indonesia, Malaya, Burma, and French Indochina (Vietnam, Cambodia, and Laos).

British Army's counter-insurgency campaign in the British controlled territories of South Arabia, 1967

The war, however, only accelerated forces already in existence undermining Western imperialism in Asia. Throughout the colonial world, the processes of urbanisation and capitalist investment created professional merchant classes that emerged as new Westernised elites. While imbued with Western political and economic ideas, these classes increasingly grew to resent their unequal status under European rule.

British in India and the Middle East

In India, the westward movement of Japanese forces towards Bengal during World War II had led to major concessions on the part of British authorities to Indian nationalist leaders. In 1947, the United Kingdom, devastated by war and embroiled in an economic crisis at home, granted British India its independence as two nations: India and Pakistan. Myanmar (Burma) and Sri Lanka (Ceylon), which is also part of British India, also gained their independence from the United Kingdom the following year, in 1948. In the Middle East, the United Kingdom granted independence to Jordan in 1946 and two years later, in 1948, ended its mandate of Palestine becoming the independent nation of Israel.

Dutch soldiers control the papers of Javanese women, 1946

Following the end of the war, nationalists in Indonesia demanded complete independence from the Netherlands. A brutal conflict ensued, and finally, in 1949, through United Nations mediation, the Dutch East Indies achieved independence, becoming the new nation of Indonesia. Dutch imperialism moulded this new multi-ethnic state comprising roughly 3,000 islands of the Indonesian archipelago with a population at the time of over 100 million.

The end of Dutch rule opened up latent tensions between the roughly 300 distinct ethnic groups of the islands, with the major ethnic fault line being between the Javanese and the non-Javanese.

Dutch New Guinea was under the Dutch administration until 1962 (see also West New Guinea dispute).

United States in Asia

In the Philippines, the U.S. remained committed to its previous pledges to grant the islands their independence, and the Philippines became the first of the Western-controlled Asian colonies to be granted independence post-World War II. However, the Philippines remained under pressure to adopt a political and economic system similar to the U.S.

This aim was greatly complicated by the rise of new political forces. During the war, the Hukbalahap (People's Army), which had strong ties to the Communist Party of the Philippines (PKP), fought against the Japanese occupation of the Philippines and won strong popularity among many sectors of the Filipino working class and peasantry. In 1946, the PKP participated in elections as part of the Democratic Alliance. However, with the onset of the Cold War, its growing political strength drew a reaction from the ruling government and the United States, resulting in the repression of the PKP and its associated organizations. In 1948, the PKP began organizing an armed struggle against the government and continued U.S. military presence. In 1950, the PKP created the People's Liberation Army (Hukbong Mapagpalaya ng Bayan), which mobilized thousands of troops throughout the islands. The insurgency lasted until 1956 when the PKP gave up armed struggle.

In 1968, the PKP underwent a split, and in 1969 the Maoist faction of the PKP created the New People's Army. Maoist rebels re-launched an armed struggle against the government and the U.S. military presence in the Philippines, which continues to this day.

France in Indochina

Post-war resistance to French rule
French Marine commandos wade ashore off the Annam coast in July 1950

France remained determined to retain its control of Indochina. However, in Hanoi, in 1945, a broad front of nationalists and communists led by Ho Chi Minh declared an independent Democratic Republic of Vietnam, commonly referred to as the Viet Minh regime by Western outsiders. France, seeking to regain control of Vietnam, countered with a vague offer of self-government under French rule. France's offers were unacceptable to Vietnamese nationalists; and in December 1946 the Việt Minh launched a rebellion against the French authority governing the colonies of French Indochina. The first few years of the war involved a low-level rural insurgency against French authority. However, after the Chinese communists reached the Northern border of Vietnam in 1949, the conflict turned into a conventional war between two armies equipped with modern weapons supplied by the United States and the Soviet Union. Meanwhile, the France granted the State of Vietnam based in Saigon independence in 1949 while Laos and Cambodia received independence in 1953. The US recognized the regime in Saigon, and provided the French military effort with military aid.

Meanwhile, in Vietnam, the French war against the Viet Minh continued for nearly eight years. The French were gradually worn down by guerrilla and jungle fighting. The turning point for France occurred at Dien Bien Phu in 1954, which resulted in the surrender of ten thousand French troops. Paris was forced to accept a political settlement that year at the Geneva Conference, which led to a precarious set of agreements regarding the future political status of Laos, Cambodia, and Vietnam.

Inhalant

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