Search This Blog

Friday, March 11, 2022

Archery

From Wikipedia, the free encyclopedia

Archery competition in June 1983 at Mönchengladbach, West Germany
 
A Rikbaktsa archer competes at Brazil's Indigenous Games
 
Tibetan archer, 1938
 
Master Heon Kim demonstrating Gungdo, traditional Korean archery (Kuk Kung), 2009
 
Archers in East Timor
 
Japanese archer
 
Archery in Bhutan

Archery is the sport, practice, or skill of using a bow to shoot arrows. The word comes from the Latin arcus, meaning bow. Historically, archery has been used for hunting and combat. In modern times, it is mainly a competitive sport and recreational activity. A person who practices archery is typically called an archer or a bowman, and a person who is fond of or an expert at archery is sometimes called a toxophilite or a marksman.

History

The oldest known evidence of arrows comes from South African sites such as Sibudu Cave, where the remains of bone and stone arrowheads have been found dating approximately 72,000-60,000 years ago. Based on indirect evidence, the bow also seems to have appeared or reappeared later in Eurasia, near the transition from the Upper Paleolithic to the Mesolithic. The earliest definite remains of bow and arrow from Europe are possible fragments from Germany found at Mannheim-Vogelstang dated 17,500-18,000 years ago, and at Stellmoor dated 11,000 years ago. Azilian points found in Grotte du Bichon, Switzerland, alongside the remains of both a bear and a hunter, with flint fragments found in the bear's third vertebra, suggest the use of arrows at 13,500 years ago. Other signs of its use in Europe come from the Stellmoor [de] in the Ahrensburg valley [de] north of Hamburg, Germany and dates from the late Paleolithic, about 10,000–9000 BC. The arrows were made of pine and consisted of a main shaft and a 15–20-centimetre-long (5+787+78 in) fore shaft with a flint point. There are no definite earlier bows; previous pointed shafts are known, but may have been launched by spear-throwers rather than bows. The oldest bows known so far comes from the Holmegård swamp in Denmark. At the site of Nataruk in Turkana County, Kenya, obsidian bladelets found embedded in a skull and within the thoracic cavity of another skeleton, suggest the use of stone-tipped arrows as weapons about 10,000 years ago. Bows eventually replaced the spear-thrower as the predominant means for launching shafted projectiles, on every continent except Australasia, though spear-throwers persisted alongside the bow in parts of the Americas, notably Mexico and among the Inuit.

Bows and arrows have been present in Egyptian and neighboring Nubian culture since its respective predynastic and Pre-Kerma origins. In the Levant, artifacts that could be arrow-shaft straighteners are known from the Natufian culture, (c. 10,800–8,300 BC) onwards. The Khiamian and PPN A shouldered Khiam-points may well be arrowheads.

Classical civilizations, notably the Assyrians, Greeks, Armenians, Persians, Parthians, Romans, Indians, Koreans, Chinese, and Japanese fielded large numbers of archers in their armies. Akkadians were the first to use composite bows in war according to the victory stele of Naram-Sin of Akkad. Egyptians referred to Nubia as "Ta-Seti," or "The Land of the Bow," since the Nubians were known to be expert archers, and by the 16th Century BC Egyptians were using the composite bow in warfare. The Bronze Age Aegean Cultures were able to deploy a number of state-owned specialized bow makers for warfare and hunting purposes already from the 15th century BC. The Welsh longbow proved its worth for the first time in Continental warfare at the Battle of Crécy. In the Americas archery was widespread at European contact.

Archery was highly developed in Asia. The Sanskrit term for archery, dhanurveda, came to refer to martial arts in general. In East Asia, Goguryeo, one of the Three Kingdoms of Korea was well known for its regiments of exceptionally skilled archers.

Mounted archery

Hunting for flying birds from the back of a galloping horse was considered the top category of archery. The favourite hobby of Prince Maximilian, engraved by Dürer

Tribesmen of Central Asia (after the domestication of the horse) and American Plains Indians (after gaining access to horses by Europeans) became extremely adept at archery on horseback. Lightly armoured, but highly mobile archers were excellently suited to warfare in the Central Asian steppes, and they formed a large part of armies that repeatedly conquered large areas of Eurasia. Shorter bows are more suited to use on horseback, and the composite bow enabled mounted archers to use powerful weapons. Empires throughout the Eurasian landmass often strongly associated their respective "barbarian" counterparts with the usage of the bow and arrow, to the point where powerful states like the Han Dynasty referred to their neighbours, the Xiong-nu, as "Those Who Draw the Bow". For example, Xiong-nu mounted bowmen made them more than a match for the Han military, and their threat was at least partially responsible for Chinese expansion into the Ordos region, to create a stronger, more powerful buffer zone against them. It is possible that "barbarian" peoples were responsible for introducing archery or certain types of bows to their "civilized" counterparts—the Xiong-nu and the Han being one example. Similarly, short bows seem to have been introduced to Japan by northeast Asian groups.

Decline of archery

The development of firearms rendered bows obsolete in warfare, although efforts were sometimes made to preserve archery practice. In England and Wales, for example, the government tried to enforce practice with the longbow until the end of the 16th century. This was because it was recognized that the bow had been instrumental to military success during the Hundred Years' War. Despite the high social status, ongoing utility, and widespread pleasure of archery in Armenia, China, Egypt, England and Wales, the Americas, India, Japan, Korea, Turkey and elsewhere, almost every culture that gained access to even early firearms used them widely, to the neglect of archery. Early firearms were inferior in rate-of-fire, and were very sensitive to wet weather. However, they had longer effective range and were tactically superior in the common situation of soldiers shooting at each other from behind obstructions. They also required significantly less training to use properly, in particular penetrating steel armor without any need to develop special musculature. Armies equipped with guns could thus provide superior firepower, and highly trained archers became obsolete on the battlefield. However, the bow and arrow is still an effective weapon, and archers have seen military action in the 21st century.Traditional archery remains in use for sport, and for hunting in many areas.

Late 18th-century revival

A print of the 1822 meeting of the "Royal British Bowmen" archery club.

Early recreational archery societies included the Finsbury Archers and the Ancient Society of Kilwinning Archers. The latter's annual Papingo event was first recorded in 1483. (In this event, archers shoot vertically from the base of an abbey tower to dislodge a wood pigeon placed approximately 30 m or 33 yards above.) The Royal Company of Archers was formed in 1676 and is one of the oldest sporting bodies in the world. Archery remained a small and scattered pastime, however, until the late 18th century when it experienced a fashionable revival among the aristocracy. Sir Ashton Lever, an antiquarian and collector, formed the Toxophilite Society in London in 1781, with the patronage of George, the Prince of Wales.

Archery societies were set up across the country, each with its own strict entry criteria and outlandish costumes. Recreational archery soon became extravagant social and ceremonial events for the nobility, complete with flags, music and 21 gun salutes for the competitors. The clubs were "the drawing rooms of the great country houses placed outside" and thus came to play an important role in the social networks of the local upper class. As well as its emphasis on display and status, the sport was notable for its popularity with females. Young women could not only compete in the contests but retain and show off their sexuality while doing so. Thus, archery came to act as a forum for introductions, flirtation and romance. It was often consciously styled in the manner of a Medieval tournament with titles and laurel wreaths being presented as a reward to the victor. General meetings were held from 1789, in which local lodges convened together to standardise the rules and ceremonies. Archery was also co-opted as a distinctively British tradition, dating back to the lore of Robin Hood and it served as a patriotic form of entertainment at a time of political tension in Europe. The societies were also elitist, and the new middle class bourgeoisie were excluded from the clubs due to their lack of social status.

After the Napoleonic Wars, the sport became increasingly popular among all classes, and it was framed as a nostalgic reimagining of the preindustrial rural Britain. Particularly influential was Sir Walter Scott's 1819 novel, Ivanhoe that depicted the heroic character Lockseley winning an archery tournament.

An archer in the coat of arms of Lieksa, based on the 1669 seal of the old town of Brahea.

A modern sport

The 1840s saw the second attempts at turning the recreation into a modern sport. The first Grand National Archery Society meeting was held in York in 1844 and over the next decade the extravagant and festive practices of the past were gradually whittled away and the rules were standardized as the 'York Round' - a series of shoots at 60 yards (55 m), 80 yards (73 m), and 100 yards (91 m). Horace A. Ford helped to improve archery standards and pioneered new archery techniques. He won the Grand National 11 times in a row and published a highly influential guide to the sport in 1856.

Picture of Saxton Pope taken while grizzly hunting at Yellowstone

Towards the end of the 19th century, the sport experienced declining participation as alternative sports such as croquet and tennis became more popular among the middle class. By 1889, just 50 archery clubs were left in Britain, but it was still included as a sport at the 1900 Paris Olympics.

The National Archery Association of the United States was organized in 1879, in part by Maurice Thompson (the author of the seminal text “The Witchery of Archery”) and his brother Will Thompson. Maurice was president in its inaugural year and Will was president in 1882, 1903, and 1904. The 1910 President was Frank E Canfield. Today it is known as USA Archery and is recognized by United States Olympic & Paralympic Committee.

In the United States, primitive archery was revived in the early 20th century. The last of the Yahi Indian tribe, a native known as Ishi, came out of hiding in California in 1911. His doctor, Saxton Pope, learned many of Ishi's traditional archery skills, and popularized them. The Pope and Young Club, founded in 1961 and named in honor of Pope and his friend, Arthur Young, became one of North America's leading bowhunting and conservation organizations. Founded as a nonprofit scientific organization, the Club was patterned after the prestigious Boone and Crockett Club and advocated responsible bowhunting by promoting quality, fair chase hunting, and sound conservation practices.

Five women taking part in an archery contest in 1931

From the 1920s, professional engineers took an interest in archery, previously the exclusive field of traditional craft experts. They led the commercial development of new forms of bow including the modern recurve and compound bow. These modern forms are now dominant in modern Western archery; traditional bows are in a minority. Archery returned to the Olympics in 1972. In the 1980s, the skills of traditional archery were revived by American enthusiasts, and combined with the new scientific understanding. Much of this expertise is available in the Traditional Bowyer's Bibles (see Further reading). Modern game archery owes much of its success to Fred Bear, an American bow hunter and bow manufacturer.

In 2021, five people were killed and three injured by an archer in Norway in the Kongsberg attack.

Mythology

Vishwamitra archery training from Ramayana

Deities and heroes in several mythologies are described as archers, including the Greek Artemis and Apollo, the Roman Diana and Cupid, the Germanic Agilaz, continuing in legends like those of Wilhelm Tell, Palnetoke, or Robin Hood. Armenian Hayk and Babylonian Marduk, Indian Karna (also known as Radheya/son of Radha), Abhimanyu, Eklavya, Arjuna, Bhishma, Drona, Rama, and Shiva were known for their shooting skills. The famous archery competition of hitting the eye of a rotating fish while watching its reflection in the water bowl was one of the many archery skills depicted in the Mahabharata. Persian Arash was a famous archer. Earlier Greek representations of Heracles normally depict him as an archer. Archery, and the bow, play an important part in the epic poem the Odyssey, when Odysseus returns home in disguise and then bests the suitors in an archery competition after hinting at his identity by stringing and drawing his great bow that only he can draw, a similar motif is present in the Turkic heroic poem Alpamysh.

The Nymphai Hyperboreioi (Νύμφαι Ὑπερβόρειοι) were worshipped on the Greek island of Delos as attendants of Artemis, presiding over aspects of archery; Hekaerge (Ἑκαέργη), represented distancing, Loxo (Λοξώ), trajectory, and Oupis (Οὖπις), aim.

Yi the archer and his apprentice Feng Meng appear in several early Chinese myths, and the historical character of Zhou Tong features in many fictional forms. Jumong, the first Taewang of the Goguryeo kingdom of the Three Kingdoms of Korea, is claimed by legend to have been a near-godlike archer. Archery features in the story of Oguz Khagan. Similarly, archery and the bow feature heavily into historical Korean identity.

In West African Yoruba belief, Osoosi is one of several deities of the hunt who are identified with bow and arrow iconography and other insignia associated with archery.

Equipment

Types of bows

A Pacific yew selfbow drawn by the split finger method. Selfbows are made from a single piece of wood.

While there is great variety in the construction details of bows (both historic and modern), all bows consist of a string attached to elastic limbs that store mechanical energy imparted by the user drawing the string. Bows may be broadly split into two categories: those drawn by pulling the string directly and those that use a mechanism to pull the string.

Directly drawn bows may be further divided based upon differences in the method of limb construction, notable examples being self bows, laminated bows and composite bows. Bows can also be classified by the bow shape of the limbs when unstrung; in contrast to traditional European straight bows, a recurve bow and some types of longbow have tips that curve away from the archer when the bow is unstrung. The cross-section of the limb also varies; the classic longbow is a tall bow with narrow limbs that are D-shaped in cross section, and the flatbow has flat wide limbs that are approximately rectangular in cross-section. Cable-backed bows use cords as the back of the bow; the draw weight of the bow can be adjusted by changing the tension of the cable. They were widespread among Inuit who lacked easy access to good bow wood. One variety of cable-backed bow is the Penobscot bow or Wabenaki bow, invented by Frank Loring (Chief Big Thunder) about 1900. It consists of a small bow attached by cables on the back of a larger main bow.

In different cultures, the arrows are released from either the left or right side of the bow, and this affects the hand grip and position of the bow. In Arab archery, Turkish archery and Kyūdō, the arrows are released from the right hand side of the bow, and this affects construction of the bow. In western archery, the arrow is usually released from the left hand side of the bow for a right-handed archer.

Modern (takedown) recurve bow

Compound bows are designed to reduce the force required to hold the string at full draw, hence allowing the archer more time to aim with less muscular stress. Most compound designs use cams or elliptical wheels on the ends of the limbs to achieve this. A typical let-off is anywhere from 65% to 80%. For example, a 60-pound (27 kg) bow with 80% let-off only requires 12 pounds-force (5.4 kgf; 53 N) to hold at full draw. Up to 99% let-off is possible. The compound bow was invented by Holless Wilbur Allen in the 1960s (a US patent was filed in 1966 and granted in 1969) and it has become the most widely used type of bow for all forms of archery in North America.

Mechanically drawn bows typically have a stock or other mounting, such as the crossbow. Crossbows typically have shorter draw lengths compared to compound bows. Because of this, heavier draw weights are required to achieve the same energy transfer to the arrow. These mechanically drawn bows also have devices to hold the tension when the bow is fully drawn. They are not limited by the strength of a single archer and larger varieties have been used as siege engines.

Types of arrows and fletchings

The most common form of arrow consists of a shaft, with an arrowhead at the front end, and fletchings and a nock at the other end. Arrows across time and history have normally been carried in a container known as a quiver, which can take many different forms. Shafts of arrows are typically composed of solid wood, bamboo, fiberglass, aluminium alloy, carbon fiber, or composite materials. Wooden arrows are prone to warping. Fiberglass arrows are brittle, but can be produced to uniform specifications easily. Aluminium shafts were a very popular high-performance choice in the latter half of the 20th century, due to their straightness, lighter weight, and subsequently higher speed and flatter trajectories. Carbon fiber arrows became popular in the 1990s because they are very light, flying even faster and flatter than aluminium arrows. Today, the most popular arrows at tournaments and Olympic events are made of composite materials.

The arrowhead is the primary functional component of the arrow. Some arrows may simply use a sharpened tip of the solid shaft, but separate arrowheads are far more common, usually made from metal, stone, or other hard materials. The most commonly used forms are target points, field points, and broadheads, although there are also other types, such as bodkin, judo, and blunt heads.

Shield cut straight fletching – here the hen feathers are barred red

Fletching is traditionally made from bird feathers, but solid plastic vanes and thin sheet-like spin vanes are used. They are attached near the nock (rear) end of the arrow with thin double sided tape, glue, or, traditionally, sinew. The most common configuration in all cultures is three fletches, though as many as six have been used. Two makes the arrow unstable in flight. When the arrow is three-fletched, the fletches are equally spaced around the shaft, with one placed such that it is perpendicular to the bow when nocked on the string, though variations are seen with modern equipment, especially when using the modern spin vanes. This fletch is called the "index fletch" or "cock feather" (also known as "the odd vane out" or "the nocking vane"), and the others are sometimes called the "hen feathers". Commonly, the cock feather is of a different color. However, if archers are using fletching made of feather or similar material, they may use same color vanes, as different dyes can give varying stiffness to vanes, resulting in less precision. When an arrow is four-fletched, two opposing fletches are often cock feathers, and occasionally the fletches are not evenly spaced.

The fletching may be either parabolic cut (short feathers in a smooth parabolic curve) or shield cut (generally shaped like half of a narrow shield), and is often attached at an angle, known as helical fletching, to introduce a stabilizing spin to the arrow while in flight. Whether helical or straight fletched, when natural fletching (bird feathers) is used it is critical that all feathers come from the same side of the bird. Oversized fletchings can be used to accentuate drag and thus limit the range of the arrow significantly; these arrows are called flu-flus. Misplacement of fletchings can change the arrow's flight path dramatically.

Bowstring

Dacron and other modern materials offer high strength for their weight and are used on most modern bows. Linen and other traditional materials are still used on traditional bows. Several modern methods of making a bowstring exist, such as the 'endless loop' and 'Flemish twist'. Almost any fiber can be made into a bowstring. The author of Arab Archery suggests the hide of a young, emaciated camel. Njál's saga describes the refusal of a wife, Hallgerður, to cut her hair to make an emergency bowstring for her husband, Gunnar Hámundarson, who is then killed.

Protective equipment

A right-hand finger tab to protect the hand while the string is drawn

Most modern archers wear a bracer (also known as an arm-guard) to protect the inside of the bow arm from being hit by the string and prevent clothing from catching the bowstring. The bracer does not brace the arm; the word comes from the armoury term "brassard", meaning an armoured sleeve or badge. The Navajo people have developed highly ornamented bracers as non-functional items of adornment. Some archers (nearly all female archers) wear protection on their chests, called chestguards or plastrons. The myth of the Amazons was that they had one breast removed to solve this problem. Roger Ascham mentions one archer, presumably with an unusual shooting style, who wore a leather guard for his face.

The drawing digits are normally protected by a leather tab, glove, or thumb ring. A simple tab of leather is commonly used, as is a skeleton glove. Medieval Europeans probably used a complete leather glove.

Eurasiatic archers who used the thumb or Mongolian draw protected their thumbs, usually with leather according to the author of Arab Archery, but also with special rings of various hard materials. Many surviving Turkish and Chinese examples are works of considerable art. Some are so highly ornamented that the users could not have used them to loose an arrow. Possibly these were items of personal adornment, and hence value, remaining extant whilst leather had virtually no intrinsic value and would also deteriorate with time. In traditional Japanese archery a special glove is used that has a ridge to assist in drawing the string.

Release aids

Release aid

A release aid is a mechanical device designed to give a crisp and precise loose of arrows from a compound bow. In the most commonly used, the string is released by a finger-operated trigger mechanism, held in the archer's hand or attached to their wrist. In another type, known as a back-tension release, the string is automatically released when drawn to a pre-determined tension.

Stabilizers

Stabilizers are mounted at various points on the bow. Common with competitive archery equipment are special brackets that allow multiple stabilizers to be mounted at various angles to fine tune the bow's balance.

Stabilizers aid in aiming by improving the balance of the bow. Sights, quivers, rests, and design of the riser (the central, non-bending part of the bow) make one side of the bow heavier. One purpose of stabilizers are to offset these forces. A reflex riser design will cause the top limb to lean towards the shooter. In this case a heavier front stabilizer is desired to offset this action. A deflex riser design has the opposite effect and a lighter front stabilizer may be used.

Stabilizers can reduce noise and vibration. These energies are absorbed by viscoelastic polymers, gels, powders, and other materials used to build stabilizers.

Stabilizers improve the forgiveness and accuracy by increasing the moment of inertia of the bow to resist movement during the shooting process. Lightweight carbon stabilizers with weighted ends are desirable because they improve the moment of inertia while minimizing the weight added.

Shooting technique and form

Historical reenactment of medieval archery
 
Chief Master Sgt. Kevin Peterson demonstrates safe archery techniques while aiming an arrow at a target on the 28th Force Support Squadron trap and skeet range at Ellsworth Air Force Base, S.D., 11 October 2012.

The standard convention on teaching archery is to hold the bow depending upon eye dominance. (One exception is in modern kyūdō where all archers are trained to hold the bow in the left hand.) Therefore, if one is right-eye dominant, they would hold the bow in the left hand and draw the string with the right hand. However, not everyone agrees with this line of thought. A smoother, and more fluid release of the string will produce the most consistently repeatable shots, and therefore may provide greater accuracy of the arrow flight. Some believe that the hand with the greatest dexterity should therefore be the hand that draws and releases the string. Either eye can be used for aiming, and the less dominant eye can be trained over time to become more effective for use. To assist with this, an eye patch can be temporarily worn over the dominant eye.

The hand that holds the bow is referred to as the bow hand and its arm the bow arm. The opposite hand is called the drawing hand or string hand. Terms such as bow shoulder or string elbow follow the same convention.

If shooting according to eye dominance, right-eye-dominant archers shooting conventionally hold the bow with their left hand. If shooting according to hand dexterity, the archer draws the string with the hand that possesses the greatest dexterity, regardless of eye dominance.

Modern form

To shoot an arrow, an archer first assumes the correct stance. The body should be at or nearly perpendicular to the target and the shooting line, with the feet placed shoulder-width apart. As an archer progresses from beginner to a more advanced level other stances such as the "open stance" or the "closed stance" may be used, although many choose to stick with a "neutral stance". Each archer has a particular preference, but mostly this term indicates that the leg furthest from the shooting line is a half to a whole foot-length from the other foot, on the ground.

To load, the bow is pointed toward the ground, tipped slightly clockwise of vertical (for a right handed shooter) and the shaft of the arrow is placed on the arrow rest or shelf. The back of the arrow is attached to the bowstring with the nock (a small locking groove located at the proximal end of the arrow). This step is called "nocking the arrow". Typical arrows with three vanes should be oriented such that a single vane, the "cock feather", is pointing away from the bow, to improve the clearance of the arrow as it passes the arrow rest.

A compound bow is fitted with a special type of arrow rest, known as a launcher, and the arrow is usually loaded with the cock feather/vane pointed either up, or down, depending upon the type of launcher being used.

The bowstring and arrow are held with three fingers, or with a mechanical arrow release. Most commonly, for finger shooters, the index finger is placed above the arrow and the next two fingers below, although several other techniques have their adherents around the world, involving three fingers below the arrow, or an arrow pinching technique. Instinctive shooting is a technique eschewing sights and is often preferred by traditional archers (shooters of longbows and recurves). In either the split finger or three finger under case, the string is usually placed in the first or second joint, or else on the pads of the fingers. When using a mechanical release aid, the release is hooked onto the D-loop.

Another type of string hold, used on traditional bows, is the type favoured by the Mongol warriors, known as the "thumb release", style. This involves using the thumb to draw the string, with the fingers curling around the thumb to add some support. To release the string, the fingers are opened out and the thumb relaxes to allow the string to slide off the thumb. When using this type of release, the arrow should rest on the same side of the bow as the drawing hand i.e. Left hand draw = arrow on left side of bow.

The archer then raises the bow and draws the string, with varying alignments for vertical versus slightly canted bow positions. This is often one fluid motion for shooters of recurves and longbows, which tend to vary from archer to archer. Compound shooters often experience a slight jerk during the drawback, at around the last 1+12 inches (4 cm), where the draw weight is at its maximum—before relaxing into a comfortable stable full draw position. The archer draws the string hand towards the face, where it should rest lightly at a fixed anchor point. This point is consistent from shot to shot, and is usually at the corner of the mouth, on the chin, to the cheek, or to the ear, depending on preferred shooting style. The archer holds the bow arm outwards, toward the target. The elbow of this arm should be rotated so that the inner elbow is perpendicular to the ground, though archers with hyper extendable elbows tend to angle the inner elbow toward the ground, as exemplified by the Korean archer Jang Yong-Ho. This keeps the forearm out of the way of the bowstring.

In modern form, the archer stands erect, forming a "T". The archer's lower trapezius muscles are used to pull the arrow to the anchor point. Some modern recurve bows are equipped with a mechanical device, called a clicker, which produces a clicking sound when the archer reaches the correct draw length. In contrast, traditional English Longbow shooters step "into the bow", exerting force with both the bow arm and the string hand arm simultaneously, especially when using bows having draw weights from 100 lb (45 kg) to over 175 lb (80 kg). Heavily stacked traditional bows (recurves, long bows, and the like) are released immediately upon reaching full draw at maximum weight, whereas compound bows reach their maximum weight around the last 1+12 inches (4 cm), dropping holding weight significantly at full draw. Compound bows are often held at full draw for a short time to achieve maximum accuracy.

The arrow is typically released by relaxing the fingers of the drawing hand (see Bow draw), or triggering the mechanical release aid. Usually the release aims to keep the drawing arm rigid, the bow hand relaxed, and the arrow is moved back using the back muscles, as opposed to using just arm motions. An archer should also pay attention to the recoil or follow through of his or her body, as it may indicate problems with form (technique) that affect accuracy.

Aiming methods

From Hokusai Manga, 1817

There are two main forms of aiming in archery: using a mechanical or fixed sight, or barebow.

Mechanical sights can be affixed to the bow to aid in aiming. They can be as simple as a pin, or may use optics with magnification. They usually also have a peep sight (rear sight) built into the string, which aids in a consistent anchor point. Modern compound bows automatically limit the draw length to give a consistent arrow velocity, while traditional bows allow great variation in draw length. Some bows use mechanical methods to make the draw length consistent. Barebow archers often use a sight picture, which includes the target, the bow, the hand, the arrow shaft and the arrow tip, as seen at the same time by the archer. With a fixed "anchor point" (where the string is brought to, or close to, the face), and a fully extended bow arm, successive shots taken with the sight picture in the same position fall on the same point. This lets the archer adjust aim with successive shots to achieve accuracy.

Modern archery equipment usually includes sights. Instinctive aiming is used by many archers who use traditional bows. The two most common forms of a non-mechanical release are split-finger and three-under. Split-finger aiming requires the archer to place the index finger above the nocked arrow, while the middle and ring fingers are both placed below. Three-under aiming places the index, middle, and ring fingers under the nocked arrow. This technique allows the archer to better look down the arrow since the back of the arrow is closer to the dominant eye, and is commonly called "gun barreling" (referring to common aiming techniques used with firearms).

When using short bows or shooting from horseback, it is difficult to use the sight picture. The archer may look at the target, but without including the weapon in the field of accurate view. Aiming then involves hand-eye coordination—which includes proprioception and motor-muscle memory, similar to that used when throwing a ball. With sufficient practice, such archers can normally achieve good practical accuracy for hunting or for war. Aiming without a sight picture may allow more rapid shooting, not however increasing accuracy.

Instinctive shooting is a style of shooting that includes the barebow aiming method that relies heavily upon the subconscious mind, proprioception, and motor/muscle memory to make aiming adjustments; the term used to refer to a general category of archers who did not use a mechanical or fixed sight.

Physics

Mongol archers during the time of the Mongol conquests used a smaller bow suitable for horse archery.

When a projectile is thrown by hand, the speed of the projectile is determined by the kinetic energy imparted by the thrower's muscles performing work. However, the energy must be imparted over a limited distance (determined by arm length) and therefore (because the projectile is accelerating) over a limited time, so the limiting factor is not work but rather power, which determined how much energy can be added in the limited time available. Power generated by muscles, however, is limited by force–velocity relationship, and even at the optimal contraction speed for power production, total work by the muscle is less than half of what it would be if the muscle contracted over the same distance at slow speeds, resulting in less than 1/4 the projectile launch velocity possible without the limitations of the force–velocity relationship.

When a bow is used, the muscles are able to perform work much more slowly, resulting in greater force and greater work done. This work is stored in the bow as elastic potential energy, and when the bowstring is released, this stored energy is imparted to the arrow much more quickly than can be delivered by the muscles, resulting in much higher velocity and, hence, greater distance. This same process is employed by frogs, which use elastic tendons to increase jumping distance. In archery, some energy dissipates through elastic hysteresis, reducing the overall amount released when the bow is shot. Of the remaining energy, some is dampened both by the limbs of the bow and the bowstring. Depending on the arrow's elasticity, some of the energy is also absorbed by compressing the arrow, primarily because the release of the bowstring is rarely in line with the arrow shaft, causing it to flex out to one side. This is because the bowstring accelerates faster than the archer's fingers can open, and consequently some sideways motion is imparted to the string, and hence arrow nock, as the power and speed of the bow pulls the string off the opening fingers.

Even with a release aid mechanism some of this effect is usually experienced, since the string always accelerates faster than the retaining part of the mechanism. This makes the arrow oscillate in flight—its center flexing to one side and then the other repeatedly, gradually reducing as the arrow's flight proceeds. This is clearly visible in high-speed photography of arrows at discharge. A direct effect of these energy transfers can clearly be seen when dry firing. Dry firing refers to releasing the bowstring without a nocked arrow. Because there is no arrow to receive the stored potential energy, almost all the energy stays in the bow. Some have suggested that dry firing may cause physical damage to the bow, such as cracks and fractures—and because most bows are not specifically made to handle the high amounts of energy dry firing produces, should never be done.

Snake Indians - testing bows, circa 1837 by Alfred Jacob Miller, the Walters Art Museum

Modern arrows are made to a specified 'spine', or stiffness rating, to maintain matched flexing and hence accuracy of aim. This flexing can be a desirable feature, since, when the spine of the shaft is matched to the acceleration of the bow(string), the arrow bends or flexes around the bow and any arrow-rest, and consequently the arrow, and fletchings, have an un-impeded flight. This feature is known as the archer's paradox. It maintains accuracy, for if part of the arrow struck a glancing blow on discharge, some inconsistency would be present, and the excellent accuracy of modern equipment would not be achieved.

The accurate flight of an arrow depends on its fletchings. The arrow's manufacturer (a "fletcher") can arrange fletching to cause the arrow to rotate along its axis. This improves accuracy by evening pressure buildups that would otherwise cause the arrow to "plane" on the air in a random direction after shooting. Even with a carefully made arrow, the slightest imperfection or air movement causes some unbalanced turbulence in air flow. Consequently, rotation creates an equalization of such turbulence, which, overall, maintains the intended direction of flight i.e. accuracy. This rotation is not to be confused with the rapid gyroscopic rotation of a rifle bullet. Fletching that is not arranged to induce rotation still improves accuracy by causing a restoring drag any time the arrow tilts from its intended direction of travel.

The innovative aspect of the invention of the bow and arrow was the amount of power delivered to an extremely small area by the arrow. The huge ratio of length vs. cross sectional area, coupled with velocity, made the arrow more powerful than any other hand held weapon until firearms were invented. Arrows can spread or concentrate force, depending on the application. Practice arrows, for instance, have a blunt tip that spreads the force over a wider area to reduce the risk of injury or limit penetration. Arrows designed to pierce armor in the Middle Ages used a very narrow and sharp tip ("bodkinhead") to concentrate the force. Arrows used for hunting used a narrow tip ("broadhead") that widens further, to facilitate both penetration and a large wound.

Hunting

A modern compound hunting bow

Using archery to take game animals is known as "bow hunting". Bow hunting differs markedly from hunting with firearms, as distance between hunter and prey must be much shorter to ensure a humane kill. The skills and practices of bow hunting therefore emphasize very close approach to the prey, whether by still hunting, stalking, or waiting in a blind or tree stand. In many countries, including much of the United States, bow hunting for large and small game is legal. Bow hunters generally enjoy longer seasons than are allowed with other forms of hunting such as black powder, shotgun, or rifle. Usually, compound bows are used for large game hunting due to the relatively short time it takes to master them as opposed to the longbow or recurve bow. These compound bows may feature fiber optic sights, stabilizers, and other accessories designed to increase accuracy at longer distances. Using a bow and arrow to take fish is known as "bow fishing".

Modern competitive archery

Competitive archery involves shooting arrows at a target for accuracy from a set distance or distances. This is the most popular form of competitive archery worldwide and is called target archery. A form particularly popular in Europe and America is field archery, shot at targets generally set at various distances in a wooded setting. Competitive archery in the United States is governed by USA Archery and National Field Archery Association (NFAA), which also certifies instructors.

Para-archery is an adaptation of archery for athletes with a disability, governed by the World Archery Federation (WA), and is one of the sports in the Summer Paralympic Games. There are also several other lesser-known and historical forms of archery, as well as archery novelty games and flight archery, where the aim is to shoot the greatest distance.

Mexico–United States relations

From Wikipedia, the free encyclopedia
 
Mexican–American relations
Map indicating locations of Mexico and USA




Mexico

United States
Diplomatic mission
Embassy of Mexico, Washington, D.C.Embassy of the United States, Mexico City
Envoy
Mexican Ambassador to the United States Esteban MoctezumaAmerican Ambassador to Mexico Ken Salazar

Mexico and the United States share a maritime and land border. Several treaties have been concluded between the two nations bilaterally, such as the Gadsden Purchase, and multilaterally, such as the United States–Mexico–Canada Agreement. Both are members of various international organizations, including the Organization of American States and the United Nations.

Since the late nineteenth century during the regime of President Porfirio Díaz (1876–1911), the two countries have had close diplomatic and economic ties. During Díaz's long presidency, U.S. businessmen acquired agricultural and mining interests in the country. The U.S. played an important role in the course of the Mexican Revolution (1910–20) with direct actions of the U.S. influencing the outcome.

The long border between the two countries means that peace and security in that region are important to the U.S.'s national security and international trade. The U.S. is Mexico's biggest trading partner and Mexico is the U.S.'s third-largest trading partner. In 2010, Mexico's exports totaled US$309.6 billion, and almost three quarters of those purchases were made by the United States. They are also closely connected demographically, with over one million U.S. citizens living in Mexico and Mexico being the largest source of immigrants to the United States, with about 8-10 million Mexican immigrants in the US.

While condemning the terrorist attacks of 9/11 and providing considerable relief aid to the U.S. after Hurricane Katrina, the Mexican government, pursuing neutrality in international affairs, opted not to actively join the War on Terror and the Iraq War, instead being the first nation in history to formally and voluntarily leave the Inter-American Treaty of Reciprocal Assistance in 2002, though Mexico later joined the U.S. in supporting military intervention in the Libyan Civil War.

As of 2013, Mexican students form the 9th largest group of international students studying in the United States, representing 1.7% of all foreigners pursuing higher education in the U.S. The four-year term of President Donald Trump, who had provoked the ire of the Mexican government through threats against companies who invest in Mexico instead of the U.S, and his claims that he would construct a border wall and force Mexico to fund its construction, caused a decline in the relations of the two countries in the mid to late 2010s.

A 2017 survey conducted by the Pew Research Center showed 65% of Mexicans had a negative view of the US, with only 30% having a positive view. This constitutes a significant and abrupt drop from 2015, prior to the 2016 United States presidential election, when 67% of Mexicans had a positive view of the United States. The same study also showed only 5% of Mexicans had confidence in the then US leader, President Donald Trump, with 93% having no confidence in him. Similarly, a poll by YouGov showed that less than one in four Americans have a positive image of Mexico.

The border between Mexico and the United States spans four U.S. states and six Mexican states, and has over twenty commercial crossings.

History

The United States of America shares a unique and often complex relationship with the United Mexican States. With shared history stemming back to the Texas Revolution (1835–1836) and the Mexican–American War (1846–1848), several treaties have been concluded between the two nations, most notably the Gadsden Purchase, and multilaterally with Canada, the North American Free Trade Agreement (NAFTA). Mexico and the United States are members of various international organizations, such as the Organization of American States and the United Nations. Boundary disputes and allocation of boundary waters have been administered since 1889 by the International Boundary and Water Commission, which also maintains international dams and wastewater sanitation facilities. Once viewed as a model of international cooperation, in recent decades the IBWC has been heavily criticized as an institutional anachronism, by-passed by modern social, environmental and political issues. Illegal immigration, arms sales, and drug smuggling continue to be contending issues in 21st-century U.S.-Mexico relations.

Early history

U.S.–Mexico relations grew out of the earlier relations between the fledgling nation of the United States and the Spanish Empire and its viceroyalty of New Spain. Modern Mexico formed the core area of the Viceroyalty of New Spain at the time the United States gained its independence in the American Revolutionary War (1775–1783). Spain had served as an ally to the American colonists in that war.

Joel Roberts Poinsett, first U.S. envoy to an independent Mexico

The aspect of Spanish-American relations that would bear most prominently on later relations between the U.S. and Mexico was the ownership of Texas. In the early 19th century the United States claimed that Texas was part of the territory of Louisiana, and therefore had been rightfully acquired by the United States as part of the Louisiana Purchase from France in 1803. The Spanish, however, claimed it was not, as the western boundaries of Louisiana were not clearly defined. In 1819 the dispute was resolved with the signing of the Adams–Onís Treaty, in which the United States relinquished its claims to Texas and instead purchased Spanish Florida.

Instruments of ratification for an 1832 treaty between the US and the United Mexican States
 
The Territorial evolution of Mexico after independence, noting losses to the United States (red, white and orange).

In 1821 New Spain gained its independence from Spain and established the First Mexican Empire under the rule of Agustín de Iturbide, who had initially fought in the royal army against the insurgents in the independence from Spain. Independent Mexico was soon recognized by the United States. The two countries quickly established diplomatic relations, with Joel Poinsett as the first envoy. In 1828 Mexico and the United States confirmed the boundaries established by the Adams–Onís Treaty by concluding the Treaty of Limits, but certain elements in the United States were greatly displeased with the treaty, as it relinquished rights to Texas. Poinsett, a supporter of the Monroe Doctrine, was convinced that republicanism was the only acceptable form of government for all countries in the Americas, and tried to influence the government of Agustín de Iturbide, which was beginning to show signs of weakness and divisiveness. Poinsett was initially sent to negotiate the acquisition of new territories for the United States, including Texas, New Mexico, and Upper California, as well as parts of Lower California, Sonora, Coahuila, and Nuevo León; but Poinsett's offer to purchase these areas was rejected by the Mexican Ministry of Foreign Affairs headed by Juan Francisco de Azcárate. He became embroiled in the country's political turmoil until his recall in 1830, but he did try to further U.S. interests in Mexico by seeking preferential treatment of U.S. goods over those of Britain, attempting to shift the U.S.–Mexico boundary, and urging the adoption of a constitution patterned on that of the U.S. Poinsett often interfered in the Affairs of the newly born Republic, and provoked disagreements with British charge d'affaires Henry George Ward. Texas remained a focal point of U.S-Mexico relations for decades. The relationship was further affected by internal struggles within the two countries: in Mexico these included concerns over the establishment of a centralized government, while in the United States it centered around the debate over the expansion of slavery, which was expanded to the Mexican territory of Texas. Some Mexican intellectuals, including José Vasconcelos would later assign the term Poinsettismo, in reference to Joel Roberts Poinsett, to designate any act of political or cultural meddling or interference by the United States in Mexican and Latin American affairs.

Beginning in the 1820s, Americans led by Stephan F. Austin and other non-Mexicans began to settle in eastern Texas in large numbers. These Anglo-American settlers, known as Texians, were frequently at odds with the Mexican government, since they sought autonomy from the central Mexican government and the expansion of black slavery into Mexico, which had abolished the institution in 1829 under Mexican president Vicente Guerrero. Their disagreements led to the Texas Revolution, one of a series of independence movements that came to the fore following the 1835 amendments to the Constitution of Mexico, which substantially altered the governance of the country. Prior to the Texas Revolution the general public of the United States was indifferent to Texas, but afterward, public opinion was increasingly sympathetic to the Texans. Following the war a Republic of Texas was declared, though independence was not recognized by Mexico, and the boundaries between the two were never agreed upon. In 1845 the United States annexed Texas, leading to a major border dispute and eventually to the Mexican–American War.

Mexican–American War (1846–1848)

Gadsden Purchase of 1854

The Mexican–American War was fought from 1846 to 1848. Mexico refused to acknowledge that its runaway state of Texas had achieved independence and warned that annexation to the United States would mean war. The United States annexed Texas in late 1845, and the war began the next spring. U.S. President James K. Polk encouraged Congress to declare war following a number of skirmishes on the Mexican–American border. The war proved disastrous for Mexico; the Americans seized New Mexico and California and invaded Mexico's northern provinces. In September 1847, U.S. troops under General Winfield Scott captured Mexico City. The war ended in a decisive U.S. victory; the Treaty of Guadalupe Hidalgo ended the conflict. As a result, Mexico was forced to sell all of its northernmost territory, including California and New Mexico, to the United States in the Mexican Cession. Additionally, Mexico relinquished its claims to Texas, and the United States forgave Mexico's debts to U.S. citizens. Mexicans in the annexed areas became full U.S. citizens.

There had been much talk early in the war about annexing all of Mexico, primarily to enlarge the areas open to slavery. However, many Southern political leaders were in the invasion armies and they recommended against total annexation because of the differences in political culture between the United States and Mexico.

In 1854 the United States purchased an additional 30,000 square miles (78,000 km2) of desert land from Mexico in the Gadsden Purchase; the price was $10 million. The goal was to build a rail line through southern Arizona to California.

1850s

Mexican President Antonio López de Santa Anna sold Mexican territory to the United States in which is known as the Gadsden Purchase, allowing the U.S. to build a railway line more easily through that region. That purchase played a significant role in the ouster of Santa Anna by Mexican liberals, in what is known as the Revolution of Ayutla, since it was widely viewed as selling Mexico's patrimony.

As the liberals made significant political changes in Mexico and a civil war broke out between conservative opponents to the liberal reform, the liberal government of Benito Juárez negotiated with the U.S. to enable the building of an interoceanic route in southern Mexico. A treaty was concluded in 1859 between Melchor Ocampo and the U.S. representative Robert Milligan McLane, giving their names to the McLane-Ocampo Treaty. The U.S. Senate failed to ratify the treaty. Had it passed, Mexico would have made significant concessions to the U.S. in exchange for cash desperately needed by the liberal Mexican government.

Matías Romero, Mexican envoy to the United States

1860s

In 1861, Mexican conservatives looked to French leader Napoleon III to abolish the Republic led by liberal President Benito Juárez. France favored the secessionist Southern states that formed the Confederate States of America in the American Civil War, but did not accord it diplomatic recognition. The French expected that a Confederate victory would facilitate French economic dominance in Mexico. Realizing the U.S. government could not intervene in Mexico, France invaded Mexico and installed an Austrian prince Maximilian I of Mexico as its puppet ruler in 1864. Owing to the shared convictions of the democratically elected government of Juárez and U.S. President Lincoln, Matías Romero, Juárez's minister to Washington, mobilized support in the U.S. Congress and the U.S. protested France's violation of the Monroe Doctrine. Once the American Civil War came to a close in April 1865, the U.S. allowed supporters of Juárez to openly purchase weapons and ammunition and issued stronger warnings to Paris. Napoleon III ultimately withdrew his army in disgrace, and Emperor Maximilian, who remained in Mexico even when given the choice of exile, was executed by the Mexican government in 1867. The support that the U.S. had accorded the liberal government of Juárez, by refusing to recognize the government of Maximilian and then by supplying arms to liberal forces, helped improve the U.S.–Mexican relationship.

At war's end numerous Confederates fled to exile in Mexico. Many eventually returned to the U.S.

The Porfiriato (1876–1910)

With general Porfirio Díaz's seizure of the presidency in 1876, relations between Mexico and foreign powers, including the United States changed. It became more welcoming to foreign investment in order to reap economic gain, but it would not relinquish its political sovereignty. Díaz's regime aimed to implement "order and progress," which reassured foreign investors that their enterprises could flourish. Díaz was a nationalist and a military hero who had fought ably against the French Intervention (1862–67). The U.S. had aided the liberal government of Benito Juárez by not recognizing the French invaders and the puppet emperor that Mexican conservatives invited to rule over them, and the U.S. had also provided arms to the liberals once its own civil war was over. But Díaz was wary of the "colossus of the north" and the phrase "Poor Mexico! So far from God, so close to the United States" (Pobre México: tan lejos de Dios y tan cerca de los Estados Unidos) is attributed to him.

Geronimo (Goyaałé), 1887, a Bedonkohe Apache, raided both sides of the U.S.-Mexico border

Díaz had ousted president Sebastián Lerdo de Tejada in the Revolution of Tuxtepec (1876). The U.S. did not recognize the Díaz government until 1878, when Rutherford B. Hayes was president. Given that France had invaded Mexico in 1862, Mexico did not initially restore diplomatic relations with it or other European powers, but did pursue a "special relationship" with the United States. One issue causing tension between Mexico and the U.S. were indigenous groups whose traditional territories straddled what was now an international boundary, most notably the Apache tribe. The Apache leader Geronimo became infamous for his raids on both sides of the border. Bandits operating in both countries also frequently crossed the border to raid Mexican and American settlements, taking advantage of mutual distrust and the differing legal codes of both nations. These threats eventually spurred increased cooperation between American and Mexican authorities, especially when concerning mounted cavalry forces. Tensions between the U.S. and Mexico remained high, but a combination of factors in the U.S. brought about recognition of the Díaz regime. These included the need to distract the U.S. electorate from the scandal of the 1876 election by focusing on the international conflict with Mexico as well as the desire of U.S. investors and their supporters in Congress to build a railway line between Mexico City and El Paso, Texas.

With the construction of the railway line linking Mexico and the United States, the border region developed from a sparsely populated frontier region into a vibrant economic zone. The construction of the railway and collaboration of the United States and Mexican armies effectively ended the Apache Wars in the late 1880s. The line between Mexico City and El Paso, Texas was inaugurated in 1884.

An ongoing issue in the border region was the exact boundary between Mexico and the U.S., particularly because the channel of the Rio Grande shifted at intervals. In 1889, the International Boundary and Water Commission was established, and still functions in the twenty-first century.

The Taft–Díaz summit

Taft and Porfirio Díaz, historic first presidential summit, Ciudad Juárez, Mexico, October 1909

In 1909, William Howard Taft and Porfirio Díaz planned a summit in El Paso, Texas, and Ciudad Juárez, Mexico, a historic first meeting between a U.S. and a Mexican president, the first time an American president would cross the border into Mexico, and only the second international trip by a sitting president. Diaz requested the meeting to show U.S. support for his planned eighth run as president, and Taft agreed to support Diaz in order to protect the several billion dollars of American capital then invested in Mexico. Both sides agreed that the disputed Chamizal strip connecting El Paso to Ciudad Juárez would be considered neutral territory with no flags present during the summit, but the meeting focused attention on this territory and resulted in assassination threats and other serious security concerns. The Texas Rangers, 4,000 U.S. and Mexican troops, U.S. Secret Service agents, BOI agents (later FBI) and U.S. marshals were all called in to provide security. An additional 250 private security detail led by Frederick Russell Burnham, the celebrated scout, was hired by John Hays Hammond, a close friend of Taft from Yale and a former candidate for U.S. vice president in 1908 who, along with his business partner Burnham, held considerable mining interests in Mexico. On October 16, the day of the summit, Burnham and Private C.R. Moore, a Texas Ranger, discovered a man holding a concealed palm pistol standing at the El Paso Chamber of Commerce building along the procession route. Burnham and Moore captured and disarmed the assassin within only a few feet of Taft and Díaz.

The Mexican Revolution

The United States had long recognized the government of Porfirio Díaz, once the U.S. recognized his government since he had first come to power by coup. As Díaz approached eighty years old, he gave an interview to a journalist working for a U.S. publication, saying he was not going to run in the scheduled 1910 elections. This set off a flurry of political activity in Mexico about presidential succession. For the U.S., it wanted the new president to continue Díaz's policies that had been favorable to U.S. business interests and produced stability domestically and internationally. Díaz reneged on his promise not to run, exiled the most viable candidate to continue his policies, General Bernardo Reyes and had the most popular opposition candidate, Francisco I. Madero jailed. After the November elections, political unrest in Mexico became open rebellion in Morelos and in northern Mexico. The Mexican Federal Army was unequal to the challenges of the insurgents. Díaz resigned and went into exile, an interim government was installed, and new elections were held in October 1911. These were won by Madero. Initially, the U.S. was optimistic about Madero. He had disbanded the rebel forces that had forced Díaz to resign; retain the Federal Army; and appeared to be open to policies favorable to the U.S., so that the U.S. supported the transition. The U.S. began to sour on the relationship with Madero and began actively working with opponents to the regime Wilson, who took office shortly after Madero's assassination in 1913, rejected the legitimacy of Huerta's "government of butchers" and demanded that Mexico hold democratic elections. After U.S. navy personnel were arrested in the port of Tampico by Huerta's soldiers, the U.S. seized Veracruz, resulting in the death of 170 Mexican soldiers and an unknown number of Mexican civilians.

Uncle Sam saying "I've had about enough of this" as a small and barefoot Pancho Villa, gun in hand, runs away. In 1916 Wilson sent an unsuccessful punitive expedition to capture Villa after he murdered Americans in his raid on Columbus, New Mexico

Wilson sent a punitive expedition led by General John J. Pershing deep into Mexico; it deprived the rebels of supplies but failed to capture Villa.

Meanwhile, Germany was trying to divert American attention from Europe by sparking a war. It sent Mexico the Zimmermann Telegram in January 1917, offering a military alliance to reclaim New Mexico, California, Nevada, Arizona and Texas, land the United States had forcibly taken via conquest in the Mexican–American War. British intelligence intercepted the message, passing it on the U.S. government. Wilson released it to the press, escalating demands for American entry into the European War. The Mexican government rejected the proposal after its military warned of massive defeat if they attempted to follow through with the plan. Mexico stayed neutral; selling large amounts of oil to Britain for her fleet.

1920–1940

Former U.S President William Howard Taft with Mexican President Plutarco Elias Calles and U.S President Calvin Coolidge

Following the end of the military phase of the Mexican Revolution, there were claims by Americans and Mexicans for damage during the decade-long civil war. The American-Mexican Claims Commission was set up to resolve them during the presidency of revolutionary general Alvaro Obregón and U.S president Calvin Coolidge. Obregón was eager to resolve issues with the U.S., including petroleum, in order to secure diplomatic recognition from the U.S. Negotiations over oil resulted in the Bucareli Treaty in 1923.

Dwight Morrow, U.S. ambassador to Mexico, who helped mediate the end of the Cristero War

When revolutionary general Plutarco Elías Calles succeeded Obregón in 1924, he repudiated the Bucareli Treaty. Relations between the Calles government and the U.S. deteriorated further. In 1926, Calles implemented articles of the Mexican Constitution of 1917 that gave the state the power to suppress the role of the Roman Catholic Church in Mexico. A major civil uprising broke out, known as the Cristero War. The turmoil in Mexico prompted the U.S. government to replace its ambassador, appointing a Wall Street banker, Dwight W. Morrow to the post. Morrow played a key role in brokering an agreement between the Roman Catholic hierarchy and the Mexican government which ended the conflict in 1929. Morrow created a great deal of good will in Mexico by replacing the sign at the embassy to read "Embassy of the United States of America" rather than "American Embassy." He also commissioned Diego Rivera to paint murals at the palace of Hernán Cortés in Cuernavaca, Morelos, that depicted Mexican history.

During the presidency of revolutionary general Lázaro Cárdenas del Río, the controversy over petroleum again flared. Standard Oil had major investments in Mexico and a dispute between the oil workers and the company was to be resolved via the Mexican court system. The dispute, however, escalated, and on March 18, 1938, President Cárdenas used constitutional powers to expropriate foreign oil interests in Mexico and created the government-owned Petroleos Mexicanos or PEMEX. Although the United States has had a long history of interventions in Latin America, the expropriation did not result in that. U.S. President Franklin D. Roosevelt was implementing the Good Neighbor Policy, in which the U.S. eschewed the role of intervention and courted better relations with the region, which would be vital if another major conflict broke out in Europe. However, with the Great Depression, the United States implemented a program of expelling Mexicans from the U.S. in what was known as Mexican Repatriation.

U.S. President Franklin D. Roosevelt having dinner with Mexican President Manuel Ávila Camacho in Monterrey, Mexico

Under President Cárdenas, Mexico in 1934-40 expropriated three million acres of agricultural land owned by 300 Americans. Its worth was a matter of debate: between $19 million and $102 million, but nothing was paid. Roosevelt settled the matter in 1938 quietly. He refused to aggressively intervene in Mexican agrarian disputes in order not to disrupt trade. He was sympathetic to Mexican president Cárdenas's agrarian reform program, as was ambassador Josephus Daniels. On the other hand, Secretary of State Cordell Hull was antagonistic.

World War II

Bracero Program workers arriving in Los Angeles, CA, 1942.

When the U.S. did enter World War II, it negotiated an agreement with Mexican President Manuel Avila Camacho to be allies in the conflict against the Axis powers. The U.S. bought Mexican metals, especially copper and silver, but also importantly implemented a labor agreement with Mexico, known as the Bracero Program. Mexican agricultural workers were brought under contract to the U.S. to do mainly agricultural labor as well as harvesting timber in the northwest. The program continued in effect until 1964 when organized labor in the U.S. pushed for ending it. In 1940 Roosevelt appointed Nelson Rockefeller to head the new, well-funded Office of the Coordinator of Inter-American Affairs. Anti-fascist propaganda was a major project across Latin America, and was run by Rockefeller's office. It spent millions on radio broadcasts and motion pictures, hoping to reach a large audience. In addition to propaganda, large sums were allocated for economic support and development. Madison Avenue techniques generated a push back in Mexico, especially where well-informed locals resisted heavy-handed American influence. Mexico was a valuable ally in the war; many of the long-standing disputes about oil were resolved and relations were the warmest in history. The usually strident anti-American voices on the far Left were quiet because the U.S. and USSR were allies. After years of debate, Mexico sent a small air unit into the war in the Pacific. An arrangement was made whereby 250,000 Mexican citizens living in the United States served in the American forces; over 1000 were killed in combat.

Since 1945

Miguel Alemán Valdés, president of Mexico (left) and Harry S. Truman, president of the United States (right) in Washington, D.C.
 
U.S. President Lyndon B. Johnson (left) and Mexican President Adolfo López Mateos (right) unveil the new boundary marker signaling the peaceful end of the Chamizal dispute
 
President Ronald Reagan attending the North–South Summit in Cancun along with his Mexican counterpart President José López Portillo, 1981

The alliance between Mexico and the U.S. during World War II brought the two countries into a far more harmonious relationship with one another. Mexican President Manuel Avila Camacho met in person with both Franklin D. Roosevelt and Harry S. Truman, helping to cement ties with the U.S. Avila Camacho was not a leader in the Mexican Revolution himself, and held opinions that were pro-business and pro-religious that were more congenial to the U.S. while he maintained revolutionary rhetoric. During Avila Camacho's visit with Truman near the centenary of the Mexican–American War, Truman returned some of the Mexican banners captured by the United States in the conflict and praised the military cadets who died defending Mexico City during the invasion.

For bilateral relations between the U.S. and Mexico, the end of World War II meant decreased U.S. demand for Mexican labor via the guest-worker Bracero Program and for Mexican raw materials to fuel a major war. For Mexican laborers and Mexican exporters, there were fewer economic opportunities. However, while at the same time the government's coffers were full and aided post-war industrialization. In 1946, the dominant political party changed its name to the Institutional Revolutionary Party, and while maintaining revolutionary rhetoric, in fact embarked on industrialization that straddled the line between nationalist and pro-business policies. Mexico supported U.S. policies in the Cold War and did not challenge U.S. intervention in Guatemala that ousted leftist president Jacobo Arbenz.

Boundary issues and the border region

Under Mexican president Adolfo López Mateos, the U.S. and Mexico concluded a treaty on January 14, 1964, to resolve the Chamizal dispute over the boundary between the two countries, with the U.S. ceding the disputed territory. The Boundary Treaty of 1970 resolved further issues between the two countries.

Since then, jurisdictional issues regarding water rights in the Rio Grande Valley have continued to cause tension between farmers on both sides of the border, according to Mexican political scientist Armand Peschard-Sverdrup.

North American Free Trade Agreement (1994–present)

President Enrique Peña Nieto, President Donald Trump, and Prime Minister Justin Trudeau sign the agreement during the G20 summit in Buenos Aires, Argentina, on November 30, 2018.

Mexico, United States and Canada signed the North American Free Trade Agreement (NAFTA) in 1994 with the goal of eliminating barriers to trade and investment.

Since then, the United States and Mexico have tightened their economic ties. The US is Mexico's largest trading partner, accounting for close to half of all exports in 2008 and more than half of all imports in 2009. For the US, Mexico is the third largest trading partner after Canada and China as of June 2010. In 2017, two-way trade between both nations amounted to US$521.5 billion.

Illegal immigration from Mexico

The U.S.–Mexico border fence near El Paso, Texas

In 2017, 47% of illegal immigrants in the United States originate from Mexico. The United States has built a barrier on much of its border with Mexico.

In recent years, the majority crossing from Mexico into the United States have been from Central America.

Illegal trade of weapons

Weapons recovered by Mexican military in Naco, Sonora, Mexico on November 20, 2009. They include weapons bought two weeks earlier by Operation Fast and Furious suspect.

The US is the largest source of illicit traffic of weapons to Mexico. Many of the traceable weapons come from American weapons markets and festivals that do not have regulations for the buyers, and there is a geographic coincidence between the supposed American origin of the firearms and the places where these weapons are seized: mainly in the Northern Mexican states. Firearms that make their way to Mexico come from the American civilian market. However grenades are also smuggled from the US to Mexico. In an effort to control smuggling of firearms, the U.S. government is assisting Mexico with technology, equipment and training. Project Gunrunner was one such efforts between the U.S. and Mexico to collaborate in tracing Mexican guns which were manufactured in or imported legally to the U.S.

In 2015, Official reports of the U.S. government and the Bureau of Alcohol, Tobacco, Firearms and explosives (ATF) revealed that Mexican cartels improved their firearm power over that last years, and that 70% of their weapons come from the U.S.

ATF gunwalking scandal

The American ATF's Project Gunrunner has as its stated purpose the stoppage of the selling and exportation of guns from the United States into Mexico, with the goal of denying Mexican drug cartels the firearms considered "tools of the trade". However, in February 2011, it brought about a scandal when the project was accused of accomplishing the opposite by ATF permitting and facilitating "straw purchase" firearm sales to traffickers, and allowing the guns to "walk" and be transported to Mexico. Several of the guns sold under the Project Gunrunner were recovered from crime scenes in Arizona, and at crime scenes throughout Mexico, resulting in considerable controversy.

One notable incident was the "Black Swan operation" where Joaquín Guzmán Loera was finally captured. The ATF confirmed that one of the weapons the Mexican Navy seized from Guzman's gunmen was one of the many weapons that were "lost" during Project Gunrunner. Many weapons from Project Gunrunner were found in a secret compartment from the "safe house" of José Antonio Marrufo "El Jaguar", one of Guzman's most sanguinary lieutenants. He is accused of many killings in Ciudad Juarez, including the notorious massacre of 18 patients of the rehabilitation center "El Aliviane". It is believed that Marrufo armed his gunmen with weapons purchased in the United States.

Trump administration

Peña Nieto meets with Donald Trump at the G20 Hamburg summit, July 2017.

Donald Trump won the 2016 U.S. presidential election partly with campaign promises of building a border wall with Mexico (the 'Trump Wall'). After Trump signed an executive order in January 2017, mandating construction of the wall, Mexican President Enrique Peña Nieto cancelled a scheduled visit to the U.S. Trump said that Mexico would pay for the construction of the wall, but did not explain how; Mexico has in turn rejected the idea of any Mexican funding.

Peña Nieto listed ten goals he would seek in NAFTA negotiations, notably safeguarding the free flow of remittances, which amount to about $25 billion per year. In August 2018, Mexico and the United States reached a bilateral agreement on a revamped NAFTA trade deal, including provisions to boost automobile production in the U.S.

President Trump and Mexican President Andrés Manuel López Obrador, July 2020

On December 1, 2018, Mexico inaugurated President Andrés Manuel López Obrador (known as AMLO) as president.

In June 2019, a promise of a stricter Mexican asylum program and security tightening to slow the traffic of illegal immigrants into the US averted a possible tariff war between the two countries. The US had threatened a 5% import tariff on all Mexican goods.

In April 2020, Mexico closed a plant run by an American company for refusing to sell ventilators to Mexican hospitals during the COVID-19 pandemic. The firm had operated its plant under the argument it provided an “essential” service, when most non-essential plants were closed. Baja California Governor Jaime Bonilla Valdez ordered the factory closed, because it was providing no essential service to Mexicans. He said the company contacted Mexico's Foreign Relations Secretary and the American ambassador to prevent the closure order but that he did not cave in to pressure.

On July 7, 2020, President Lopez Obrador visited Washington, D.C. and met with Trump following the signing the United States–Mexico–Canada Agreement trade deal.

In late 2020, multiple human rights groups joined a whistleblower to accuse a private-owned U.S. immigration detention center in Georgia of forcible sterilization of women. The reports claimed a doctor conducted unauthorized medical procedures on women detained by the U.S. Immigration and Customs Enforcement (ICE). Some international organizations have characterized this forced sterilization as genocide. In September 2020, Mexico demanded more information from US authorities on procedures performed on migrants in these facilities, after allegations that six Mexican women were sterilized without their consent. Another women said she had undergone a gynecological operation, although there was nothing in her detention file to support she agreed to the procedure.

In October 2020, retired Secretary of National Defense Salvador Cienfuegos was arrested by U.S. officials at Los Angeles International Airport on alleged drug and money-laundering charges. General Cienfuegos's arrest infuriated President Obrador, who was particularly riled that Mexican officials had not been informed about the investigation into the general. Cienfuegos was cleared of all charges on 14 January 2021, and Obrador said the accusations against him was politically motivated. The U.S. Justice Department threatened to restart prosecution if Mexico didn't prosecute him.

Biden administration

U.S. President Biden and Mexican President Andrés Manuel López Obrador, November 2021

In March, the Biden administration confirmed it would not be sharing its COVID-19 vaccines with Mexico, according to White House press secretary Jen Psaki ahead of Biden's first bilateral meeting with Mexican President Andrés Manuel López Obrador. “The president has made clear that he is focused on ensuring vaccines are accessible to every American.” When Biden took office, Mexico had sought more cooperation with the US to increase Mexico's access to COVID-19 vaccine supplies.

In May, US regulators banned Mexican airlines from expanding new service or routes in the country. The FAA claimed there were "several areas" where the country did not meet aviation standards. President Obrador stated, "We have been complying with all the requirements. We feel that this decision should not be carried out." further stating the move appeared to help US airlines. "They are the ones who benefit and the national airlines could be harmed." As Mexico's airlines focused on domestic flights, the US ban was expected to have less impact.

In July 2021, President Lopez Obrador blamed the US embargo against Cuba for contributing to the unrest in Cuba. The foreign ministry sent two navy ships with food and medical supplies to assist Cuba.

In September 2021, Mexico sued US-based gunmakers for trafficking guns into the country. The lawsuit stated guns from America are more likely to kill Mexican citizens than American citizens. US laws however protect gun makers from civil liability and prevents victims from suing manufacturers.

Gallery

Lie group

From Wikipedia, the free encyclopedia https://en.wikipedia.org/wiki/Lie_group In mathematics , a Lie gro...