AC power

From Wikipedia, the free encyclopedia

https://en.wikipedia.org/wiki/AC_power 

 

The blinking of non-incandescent city lights is shown in this motion-blurred long exposure. The AC nature of the mains power is revealed by the dashed appearance of the traces of moving lights.

In an electric circuit, instantaneous power is the time rate of flow of energy past a given point of the circuit. In alternating current circuits, energy storage elements such as inductors and capacitors may result in periodic reversals of the direction of energy flow. Its SI unit is the watt.

The portion of instantaneous power that, averaged over a complete cycle of the AC waveform, results in net transfer of energy in one direction is known as instantaneous active power, and its time average is known as active power or real power. The portion of instantaneous power that results in no net transfer of energy but instead oscillates between the source and load in each cycle due to stored energy, is known as instantaneous reactive power, and its amplitude is the absolute value of reactive power.

Active, reactive, apparent, and complex power in sinusoidal steady-state

In a simple alternating current (AC) circuit consisting of a source and a linear time-invariant load, both the current and voltage are sinusoidal at the same frequency. If the load is purely resistive, the two quantities reverse their polarity at the same time. At every instant the product of voltage and current is positive or zero, the result being that the direction of energy flow does not reverse. In this case, only active power is transferred.

If the load is purely reactive, then the voltage and current are 90 degrees out of phase. For two quarters of each cycle, the product of voltage and current is positive, but for the other two quarters, the product is negative, indicating that on average, exactly as much energy flows into the load as flows back out. There is no net energy flow over each half cycle. In this case, only reactive power flows: There is no net transfer of energy to the load; however, electrical power does flow along the wires and returns by flowing in reverse along the same wires. The current required for this reactive power flow dissipates energy in the line resistance, even if the ideal load device consumes no energy itself. Practical loads have resistance as well as inductance, or capacitance, so both active and reactive powers will flow to normal loads.

Apparent power is the product of the RMS values of voltage and current. Apparent power is taken into account when designing and operating power systems, because although the current associated with reactive power does no work at the load, it still must be supplied by the power source. Conductors, transformers and generators must be sized to carry the total current, not just the current that does useful work. Failure to provide for the supply of sufficient reactive power in electrical grids can lead to lowered voltage levels and, under certain operating conditions, to the complete collapse of the network or blackout. Another consequence is that adding the apparent power for two loads will not accurately give the total power unless they have the same phase difference between current and voltage (the same power factor).

Conventionally, capacitors are treated as if they generate reactive power, and inductors are treated as if they consume it. If a capacitor and an inductor are placed in parallel, then the currents flowing through the capacitor and the inductor tend to cancel rather than add. This is the fundamental mechanism for controlling the power factor in electric power transmission; capacitors (or inductors) are inserted in a circuit to partially compensate for reactive power 'consumed' ('generated') by the load. Purely capacitive circuits supply reactive power with the current waveform leading the voltage waveform by 90 degrees, while purely inductive circuits absorb reactive power with the current waveform lagging the voltage waveform by 90 degrees. The result of this is that capacitive and inductive circuit elements tend to cancel each other out.

The Power Triangle
The complex power is the vector sum of active and reactive power. The apparent power is the magnitude of the complex power.
  Active power, P
  Reactive power, Q
  Complex power, S
  Apparent power, |S|
  Phase of voltage relative to current, ${\displaystyle \phi }$

Engineers use the following terms to describe energy flow in a system (and assign each of them a different unit to differentiate between them):

• Active power, P, or real power: watt (W);
• Reactive power, Q: volt-ampere reactive (var);
• Complex power, S: volt-ampere (VA);
• Apparent power, |S|: the magnitude of complex power S: volt-ampere (VA);
• Phase of voltage relative to current, φ: the angle of difference (in degrees) between current and voltage; ${\displaystyle \phi =\arg (V)-\arg (I)}$. Current lagging voltage (quadrant I vector), current leading voltage (quadrant IV vector).

These are all denoted in the adjacent diagram (called a Power Triangle).

In the diagram, P is the active power, Q is the reactive power (in this case positive), S is the complex power and the length of S is the apparent power. Reactive power does not do any work, so it is represented as the imaginary axis of the vector diagram. Active power does do work, so it is the real axis.

The unit for power is the watt (symbol: W). Apparent power is often expressed in volt-amperes (VA) since it is the product of RMS voltage and RMS current. The unit for reactive power is var, which stands for volt-ampere reactive. Since reactive power transfers no net energy to the load, it is sometimes called "wattless" power. It does, however, serve an important function in electrical grids and its lack has been cited as a significant factor in the Northeast Blackout of 2003. Understanding the relationship among these three quantities lies at the heart of understanding power engineering. The mathematical relationship among them can be represented by vectors or expressed using complex numbers, S = P + j Q (where j is the imaginary unit).

Instantaneous power in AC systems when the current lags behind the voltage by 50 degrees.

Calculations and equations in sinusoidal steady-state

The formula for complex power (units: VA) in phasor form is:

${\displaystyle S=V{I}^{\ast }=|S|\mathrm{\angle }\phi }$,

where V denotes voltage in phasor form, with the amplitude as RMS, and I denotes current in phasor form, with the amplitude as RMS. Also by convention, the complex conjugate of I is used, which is denoted ${\displaystyle I^{\ast }}$ (or ${\displaystyle \overline{I}}$), rather than I itself. This is done because otherwise using the product V I to define S would result in a quantity that depends on the reference angle chosen for V or I, but defining S as V I* results in a quantity that doesn't depend on the reference angle and allows to relate S to P and Q.

Other forms of complex power (units in volt-amps, VA) are derived from Z, the load impedance (units in ohms, Ω).

${\displaystyle S=|I{|}^{2}Z=\frac{|V{|}^2}{Z^{\ast }}}$.

Consequentially, with reference to the power triangle, real power (units in watts, W) is derived as:

${\displaystyle P=|S|\cos \phi =|I{|}^{2}R=\frac{|V{|}^2}{|Z{|}^2}\times R}$.

For a purely resistive load, real power can be simplified to:

${\displaystyle P=\frac{|V{|}^2}{R}}$.

R denotes resistance (units in ohms, Ω) of the load.

Reactive power (units in volts-amps-reactive, var) is derived as:

${\displaystyle Q=|S|\sin \phi =|I{|}^{2}X=\frac{|V{|}^2}{|Z{|}^2}\times X}$.

For a purely reactive load, reactive power can be simplified to:

${\displaystyle Q=\frac{|V{|}^2}{X}}$,

where X denotes reactance (units in ohms, Ω) of the load.

Combining, the complex power (units in volt-amps, VA) is back-derived as

${\displaystyle S=P+jQ}$,

and the apparent power (units in volt-amps, VA) as

${\displaystyle |S|=\sqrt{P^2+Q^2}}$.

These are simplified diagrammatically by the power triangle.

Power factor

Main article: Power factor

The ratio of active power to apparent power in a circuit is called the power factor. For two systems transmitting the same amount of active power, the system with the lower power factor will have higher circulating currents due to energy that returns to the source from energy storage in the load. These higher currents produce higher losses and reduce overall transmission efficiency. A lower power factor circuit will have a higher apparent power and higher losses for the same amount of active power. The power factor is 1.0 when the voltage and current are in phase. It is zero when the current leads or lags the voltage by 90 degrees. When the voltage and current are 180 degrees out of phase, the power factor is negative one, and the load is feeding energy into the source (an example would be a home with solar cells on the roof that feed power into the power grid when the sun is shining). Power factors are usually stated as "leading" or "lagging" to show the sign of the phase angle of current with respect to voltage. Voltage is designated as the base to which current angle is compared, meaning that current is thought of as either "leading" or "lagging" voltage. Where the waveforms are purely sinusoidal, the power factor is the cosine of the phase angle (${\displaystyle \phi }$) between the current and voltage sinusoidal waveforms. Equipment data sheets and nameplates will often abbreviate power factor as "${\displaystyle \cos \varphi }$" for this reason.

Example: The active power is 700 W and the phase angle between voltage and current is 45.6°. The power factor is cos(45.6°) = 0.700. The apparent power is then: 700 W / cos(45.6°) = 1000 VA. The concept of power dissipation in AC circuit is explained and illustrated with the example.

For instance, a power factor of 0.68 means that only 68 percent of the total current supplied (in magnitude) is actually doing work; the remaining current does no work at the load.

Reactive power

In a direct current circuit, the power flowing to the load is proportional to the product of the current through the load and the potential drop across the load. Energy flows in one direction from the source to the load. In AC power, the voltage and current both vary approximately sinusoidally. When there is inductance or capacitance in the circuit, the voltage and current waveforms do not line up perfectly. The power flow has two components – one component flows from source to load and can perform work at the load; the other portion, known as "reactive power", is due to the delay between voltage and current, known as phase angle, and cannot do useful work at the load. It can be thought of as current that is arriving at the wrong time (too late or too early). To distinguish reactive power from active power, it is measured in units of "volt-amperes reactive", or var. These units can simplify to watts but are left as var to denote that they represent no actual work output.

Energy stored in capacitive or inductive elements of the network gives rise to reactive power flow. Reactive power flow strongly influences the voltage levels across the network. Voltage levels and reactive power flow must be carefully controlled to allow a power system to be operated within acceptable limits. A technique known as reactive compensation is used to reduce apparent power flow to a load by reducing reactive power supplied from transmission lines and providing it locally. For example, to compensate an inductive load, a shunt capacitor is installed close to the load itself. This allows all reactive power needed by the load to be supplied by the capacitor and not have to be transferred over the transmission lines. This practice saves energy because it reduces the amount of energy that is required to be produced by the utility to do the same amount of work. Additionally, it allows for more efficient transmission line designs using smaller conductors or fewer bundled conductors and optimizing the design of transmission towers.

Capacitive vs. inductive loads

Stored energy in the magnetic or electric field of a load device, such as a motor or capacitor, causes an offset between the current and the voltage waveforms. A capacitor is a device that stores energy in the form of an electric field. As current is driven through the capacitor, charge build-up causes an opposing voltage to develop across the capacitor. This voltage increases until some maximum dictated by the capacitor structure. In an AC network, the voltage across a capacitor is constantly changing. The capacitor opposes this change, causing the current to lead the voltage in phase. Capacitors are said to "source" reactive power, and thus to cause a leading power factor.

Induction machines are some of the most common types of loads in the electric power system today. These machines use inductors, or large coils of wire to store energy in the form of a magnetic field. When a voltage is initially placed across the coil, the inductor strongly resists this change in a current and magnetic field, which causes a time delay for the current to reach its maximum value. This causes the current to lag behind the voltage in phase. Inductors are said to "sink" reactive power, and thus to cause a lagging power factor. Induction generators can source or sink reactive power, and provide a measure of control to system operators over reactive power flow and thus voltage. Because these devices have opposite effects on the phase angle between voltage and current, they can be used to "cancel out" each other's effects. This usually takes the form of capacitor banks being used to counteract the lagging power factor caused by induction motors.

Reactive power control

Main article: Voltage control and reactive power management

Transmission connected generators are generally required to support reactive power flow. For example, on the United Kingdom transmission system, generators are required by the Grid Code Requirements to supply their rated power between the limits of 0.85 power factor lagging and 0.90 power factor leading at the designated terminals. The system operator will perform switching actions to maintain a secure and economical voltage profile while maintaining a reactive power balance equation:

${\displaystyle \mathrm{G}\mathrm{e}\mathrm{n}\mathrm{e}\mathrm{r}\mathrm{a}\mathrm{t}\mathrm{o}\mathrm{r}\mathrm{M}\mathrm{V}\mathrm{A}\mathrm{R}\mathrm{s}+\mathrm{S}\mathrm{y}\mathrm{s}\mathrm{t}\mathrm{e}\mathrm{m}\mathrm{g}\mathrm{a}\mathrm{i}\mathrm{n}+\mathrm{S}\mathrm{h}\mathrm{u}\mathrm{n}\mathrm{t}\mathrm{c}\mathrm{a}\mathrm{p}\mathrm{a}\mathrm{c}\mathrm{i}\mathrm{t}\mathrm{o}\mathrm{r}\mathrm{s}=\mathrm{M}\mathrm{V}\mathrm{A}\mathrm{R}\mathrm{D}\mathrm{e}\mathrm{m}\mathrm{a}\mathrm{n}\mathrm{d}+\mathrm{R}\mathrm{e}\mathrm{a}\mathrm{c}\mathrm{t}\mathrm{i}\mathrm{v}\mathrm{e}\mathrm{l}\mathrm{o}\mathrm{s}\mathrm{s}\mathrm{e}\mathrm{s}+\mathrm{S}\mathrm{h}\mathrm{u}\mathrm{n}\mathrm{t}\mathrm{r}\mathrm{e}\mathrm{a}\mathrm{c}\mathrm{t}\mathrm{o}\mathrm{r}\mathrm{s}}$

The "system gain" is an important source of reactive power in the above power balance equation, which is generated by the capacitative nature of the transmission network itself. By making decisive switching actions in the early morning before the demand increases, the system gain can be maximized early on, helping to secure the system for the whole day. To balance the equation some pre-fault reactive generator use will be required. Other sources of reactive power that will also be used include shunt capacitors, shunt reactors, static VAR compensators and voltage control circuits.

Unbalanced sinusoidal polyphase systems

While active power and reactive power are well defined in any system, the definition of apparent power for unbalanced polyphase systems is considered to be one of the most controversial topics in power engineering. Originally, apparent power arose merely as a figure of merit. Major delineations of the concept are attributed to Stanley's Phenomena of Retardation in the Induction Coil (1888) and Steinmetz's Theoretical Elements of Engineering (1915). However, with the development of three phase power distribution, it became clear that the definition of apparent power and the power factor could not be applied to unbalanced polyphase systems. In 1920, a "Special Joint Committee of the AIEE and the National Electric Light Association" met to resolve the issue. They considered two definitions.

${\displaystyle S_A=|S_{\mathrm{a}}|+|S_{\mathrm{b}}|+|S_{\mathrm{c}}|}$

${\displaystyle {\mathrm{p}\mathrm{f}}_A=\frac{P_{\mathrm{a}}+P_{\mathrm{b}}+P_{\mathrm{c}}}{S_A}}$,

that is, the arithmetic sum of the phase apparent powers; and

${\displaystyle S_V=|P_{\mathrm{a}}+P_{\mathrm{b}}+P_{\mathrm{c}}+j(Q_{\mathrm{a}}+Q_{\mathrm{b}}+Q_{\mathrm{c}})|}$

${\displaystyle {\mathrm{p}\mathrm{f}}_V=\frac{P_{\mathrm{a}}+P_{\mathrm{b}}+P_{\mathrm{c}}}{S_V}}$,

that is, the magnitude of total three-phase complex power.

The 1920 committee found no consensus and the topic continued to dominate discussions. In 1930, another committee formed and once again failed to resolve the question. The transcripts of their discussions are the lengthiest and most controversial ever published by the AIEE. Further resolution of this debate did not come until the late 1990s.

A new definition based on symmetrical components theory was proposed in 1993 by Alexander Emanuel for unbalanced linear load supplied with asymmetrical sinusoidal voltages:

${\displaystyle S=\sqrt{\left(|V_{\mathrm{a}}^2|+|V_{\mathrm{b}}^2|+|V_{\mathrm{c}}^2|\right)\left(|I_{\mathrm{a}}^2|+|I_{\mathrm{b}}^2|+|I_{\mathrm{c}}^2|\right)}}$

${\displaystyle \mathrm{p}\mathrm{f}=\frac{P^{+}}{S}}$,

that is, the root of squared sums of line voltages multiplied by the root of squared sums of line currents. ${\displaystyle P^{+}}$ denotes the positive sequence power:

${\displaystyle P^{+}=3|V^{+}||I^{+}|\cos (\arg (V^{+})-\arg (I^{+}))}$

${\displaystyle V^{+}}$ denotes the positive sequence voltage phasor, and ${\displaystyle I^{+}}$ denotes the positive sequence current phasor.

Real number formulas

A perfect resistor stores no energy; so current and voltage are in phase. Therefore, there is no reactive power and ${\displaystyle P=S}$ (using the passive sign convention). Therefore, for a perfect resistor

${\displaystyle P=S=V_{\mathrm{R}\mathrm{M}\mathrm{S}}{I}_{\mathrm{R}\mathrm{M}\mathrm{S}}=I_{\mathrm{R}\mathrm{M}\mathrm{S}}^{2}R=\frac{V_{\mathrm{R}\mathrm{M}\mathrm{S}}^2}{R}}$.

For a perfect capacitor or inductor, there is no net power transfer; so all power is reactive. Therefore, for a perfect capacitor or inductor:

${\displaystyle \begin{array}{rl}P& =0\\ Q& =|S|=V_{\mathrm{R}\mathrm{M}\mathrm{S}}{I}_{\mathrm{R}\mathrm{M}\mathrm{S}}=I_{\mathrm{R}\mathrm{M}\mathrm{S}}^2|X|=\frac{V_{\mathrm{R}\mathrm{M}\mathrm{S}}^2}{|X|}\end{array}}$.

where ${\displaystyle X}$ is the reactance of the capacitor or inductor.

If ${\displaystyle X}$ is defined as being positive for an inductor and negative for a capacitor, then the modulus signs can be removed from S and X and get

${\displaystyle Q=I_{\mathrm{R}\mathrm{M}\mathrm{S}}^{2}X=\frac{V_{\mathrm{R}\mathrm{M}\mathrm{S}}^2}{X}}$.

Instantaneous power is defined as:

${\displaystyle p(t)=v(t)i(t)}$,

where ${\displaystyle v(t)}$ and ${\displaystyle i(t)}$ are the time-varying voltage and current waveforms.

This definition is useful because it applies to all waveforms, whether they are sinusoidal or not. This is particularly useful in power electronics, where non-sinusoidal waveforms are common.

In general, engineers are interested in the active power averaged over a period of time, whether it is a low frequency line cycle or a high frequency power converter switching period. The simplest way to get that result is to take the integral of the instantaneous calculation over the desired period:

${\displaystyle P_{\text{avg}}=\frac{1}{t_2-t_1}{\int }_{t_1}^{t_2}v(t)i(t)\mathrm{d}t}$.

This method of calculating the average power gives the active power regardless of harmonic content of the waveform. In practical applications, this would be done in the digital domain, where the calculation becomes trivial when compared to the use of rms and phase to determine active power:

${\displaystyle P_{\text{avg}}=\frac{1}{n}\sum _{k=1}^{n}V[k]I[k]}$.

Multiple frequency systems

Since an RMS value can be calculated for any waveform, apparent power can be calculated from this. For active power it would at first appear that it would be necessary to calculate many product terms and average all of them. However, looking at one of these product terms in more detail produces a very interesting result.

${\displaystyle \begin{array}{rl}& A\cos ({\omega }_{1}t+k_1)\cos ({\omega }_{2}t+k_2)\\ =& \frac{A}{2}\cos \left[\left({\omega }_{1}t+k_1\right)+\left({\omega }_{2}t+k_2\right)\right]+\frac{A}{2}\cos \left[\left({\omega }_{1}t+k_1\right)-\left({\omega }_{2}t+k_2\right)\right]\\ =& \frac{A}{2}\cos \left[\left({\omega }_1+{\omega }_2\right)t+k_1+k_2\right]+\frac{A}{2}\cos \left[\left({\omega }_1-{\omega }_2\right)t+k_1-k_2\right]\end{array}}$

However, the time average of a function of the form cos(ωt + k) is zero provided that ω is nonzero. Therefore, the only product terms that have a nonzero average are those where the frequency of voltage and current match. In other words, it is possible to calculate active (average) power by simply treating each frequency separately and adding up the answers. Furthermore, if voltage of the mains supply is assumed to be a single frequency (which it usually is), this shows that harmonic currents are a bad thing. They will increase the RMS current (since there will be non-zero terms added) and therefore apparent power, but they will have no effect on the active power transferred. Hence, harmonic currents will reduce the power factor. Harmonic currents can be reduced by a filter placed at the input of the device. Typically this will consist of either just a capacitor (relying on parasitic resistance and inductance in the supply) or a capacitor-inductor network. An active power factor correction circuit at the input would generally reduce the harmonic currents further and maintain the power factor closer to unity.

Nation state

From Wikipedia, the free encyclopedia

https://en.wikipedia.org/wiki/Nation_state 

 

Portrait of "The Ratification of the Treaty of Münster", one of the treaties leading to the Peace of Westphalia, where the concept of the "nation state" was born.

A nation state is a political unit where the state and nation are congruent. It is a more precise concept than "country", since a country does not need to have a predominant ethnic group.

A nation, in the sense of a common ethnicity, may include a diaspora or refugees who live outside the nation state; some nations of this sense do not have a state where that ethnicity predominates. In a more general sense, a nation state is simply a large, politically sovereign country or administrative territory. A nation state may be contrasted with:

• A multinational state, where no one ethnic group dominates (such a state may also be considered a multicultural state depending on the degree of cultural assimilation of various groups).
• A city-state, which is both smaller than a "nation" in the sense of "large sovereign country" and which may or may not be dominated by all or part of a single "nation" in the sense of a common ethnicity.
• An empire, which is composed of many countries (possibly non-sovereign states) and nations under a single monarch or ruling state government.
• A confederation, a league of sovereign states, which might or might not include nation-states.
• A federated state, which may or may not be a nation-state, and which is only partially self-governing within a larger federation (for example, the state boundaries of Bosnia and Herzegovina are drawn along ethnic lines, but those of the United States are not).

This article mainly discusses the more specific definition of a nation-state as a typically sovereign country dominated by a particular ethnicity.

Complexity

The relationship between a nation (in the ethnic sense) and a state can be complex. The presence of a state can encourage ethnogenesis, and a group with a pre-existing ethnic identity can influence the drawing of territorial boundaries or argue for political legitimacy.

This definition of a "nation-state" is not universally accepted. "All attempts to develop terminological consensus around "nation" resulted in failure", concludes academic Valery Tishkov.

Walker Connor discusses the impressions surrounding the characters of "nation", "(sovereign) state", "nation state", and "nationalism". Connor, who gave the term "ethnonationalism" wide currency, also discusses the tendency to confuse nation and state and the treatment of all states as if nation states.

History and origins

Main article: Nation

The origins and early history of nation states are disputed. A major theoretical question is: "Which came first, the nation or the nation state?" Scholars such as Steven Weber, David Woodward, Michel Foucault and Jeremy Black have advanced the hypothesis that the nation state did not arise out of political ingenuity or an unknown undetermined source, nor was it a political invention; but is an inadvertent byproduct of 15th-century intellectual discoveries in political economy, capitalism, mercantilism, political geography, and geography combined with cartography and advances in map-making technologies. It was with these intellectual discoveries and technological advances that the nation state arose. For others, the nation existed first, then nationalist movements arose for sovereignty, and the nation state was created to meet that demand. Some "modernization theories" of nationalism see it as a product of government policies to unify and modernize an already existing state. Most theories see the nation state as a 19th-century European phenomenon, facilitated by developments such as state-mandated education, mass literacy and mass media. However, historians also note the early emergence of a relatively unified state and identity in Portugal and the Dutch Republic.

In France, Eric Hobsbawm argues, the French state preceded the formation of the French people. Hobsbawm considers that the state made the French nation, not French nationalism, which emerged at the end of the 19th century, the time of the Dreyfus Affair. At the time of the 1789 French Revolution, only half of the French people spoke some French, and 12–13% spoke the version of it that was to be found in literature and in educational facilities, according to Hobsbawm.

During the Italian unification, the number of people speaking the Italian language was even lower. The French state promoted the replacement of various regional dialects and languages by a centralised French language, and so did, and still does, Italy. The introduction of conscription and the Third Republic's 1880s laws on public instruction facilitated the creation of a national identity under this theory.

The Revolutions of 1848 were democratic and liberal in nature, with the aim of removing the old monarchical structures and creating independent nation-states.

Some nation states, such as Germany and Italy, came into existence at least partly as a result of political campaigns by nationalists, during the 19th century. In both cases, the territory was previously divided among other states, some of them very small. The sense of common identity was at first a cultural movement, such as in the Völkisch movement in German-speaking states, which rapidly acquired a political significance. In these cases, the nationalist sentiment and the nationalist movement clearly precede the unification of the German and Italian nation states.

Historians Hans Kohn, Liah Greenfeld, Philip White and others have classified nations such as Germany or Italy, where cultural unification preceded state unification, as ethnic nations or ethnic nationalities. However, "state-driven" national unifications, such as in France, England or China, are more likely to flourish in multiethnic societies, producing a traditional national heritage of civic nations, or territory-based nationalities.

The idea of a nation state was and is associated with the rise of the modern system of states, often called the "Westphalian system" in reference to the Treaty of Westphalia (1648). The balance of power, which characterized that system, depended on its effectiveness upon clearly defined, centrally controlled, independent entities, whether empires or nation states, which recognize each other's sovereignty and territory. The Westphalian system did not create the nation state, but the nation state meets the criteria for its component states (by assuming that there is no disputed territory). Before the Westphalian system, the closest geopolitical system was the "Chanyuan system" established in East Asia in 1005 through the Treaty of Chanyuan, which, like the Westphalian peace treaties, designated national borders between the independent regimes of China's Song dynasty and the nomadic Liao dynasty. This system was copied and developed in East Asia in the following centuries until the establishment of the pan-Eurasian Mongol Empire in the 13th century.

The nation state received a philosophical underpinning in the era of Romanticism, at first as the "natural" expression of the individual peoples (romantic nationalism: see Johann Gottlieb Fichte's conception of the Volk, later opposed by Ernest Renan). The increasing emphasis during the 19th century on the ethnic and racial origins of the nation, led to a redefinition of the nation state in these terms. Racism, which in Boulainvilliers's theories was inherently antipatriotic and antinationalist, joined itself with colonialist imperialism and "continental imperialism", most notably in pan-Germanic and pan-Slavic movements.

The relation between racism and ethnic nationalism reached its height in the 20th century fascism and Nazism. The specific combination of "nation" ("people") and "state" expressed in such terms as the Völkische Staat and implemented in laws such as the 1935 Nuremberg laws made fascist states such as early Nazi Germany qualitatively different from non-fascist nation states. Minorities were not considered part of the people (Volk), and were consequently denied to have an authentic or legitimate role in such a state. In Germany, neither Jews nor the Roma were considered part of the people and both were specifically targeted for persecution. German nationality law defined "German" on the basis of German ancestry, excluding all non-Germans from the people.

In recent years, a nation state's claim to absolute sovereignty within its borders has been criticized. A global political system based on international agreements and supra-national blocs characterized the post-war era. Non-state actors, such as international corporations and non-governmental organizations, are widely seen as eroding the economic and political power of nation states.

According to Andreas Wimmer and Yuval Feinstein, nation-states tended to emerge when power shifts allowed nationalists to overthrow existing regimes or absorb existing administrative units. Xue Li and Alexander Hicks links the frequency of nation-state creation to processes of diffusion that emanate from international organizations.

Before the nation state

Dissolution of the multiethnic Austro-Hungarian Empire (1918)

In Europe, during the 18th century, the classic non-national states were the multiethnic empires, the Austrian Empire, the Kingdom of France (and its empire), the Kingdom of Hungary, the Russian Empire, the Portuguese Empire, the Spanish Empire, the Ottoman Empire, the British Empire, the Dutch Empire and smaller nations at what would now be called sub-state level. The multi-ethnic empire was an absolute monarchy ruled by a king, emperor or sultan. The population belonged to many ethnic groups, and they spoke many languages. The empire was dominated by one ethnic group, and their language was usually the language of public administration. The ruling dynasty was usually, but not always, from that group.

This type of state is not specifically European: such empires existed in Asia, Africa and the Americas. Chinese dynasties, such as the Tang dynasty, the Ming dynasty, and the Qing dynasty, were all multiethnic regimes governed by a ruling ethnic group. In the three examples, their ruling ethnic groups were the Turks, the Han-Chinese, and the Manchus, respectively. In the Muslim world, immediately after Muhammad's death in 632, Caliphates were established. Caliphates were Islamic states under the leadership of a political-religious successor to the Islamic prophet Muhammad. These polities developed into multi-ethnic trans-national empires. The Ottoman sultan, Selim I (1512–1520) reclaimed the title of caliph, which had been in dispute and asserted by a diversity of rulers and "shadow caliphs" in the centuries of the Abbasid-Mamluk Caliphate since the Mongols' sacking of Baghdad and the killing of the last Abbasid Caliph in Baghdad, Iraq 1258. The Ottoman Caliphate as an office of the Ottoman Empire was abolished under Mustafa Kemal Atatürk in 1924 as part of Atatürk's Reforms.

Some of the smaller European states were not so ethnically diverse, but were also dynastic states, ruled by a royal house. Their territory could expand by royal intermarriage or merge with another state when the dynasty merged. In some parts of Europe, notably Germany, very small territorial units existed. They were recognized by their neighbors as independent, and had their own government and laws. Some were ruled by princes or other hereditary rulers, some were governed by bishops or abbots. Because they were so small, however, they had no separate language or culture: the inhabitants shared the language of the surrounding region.

In some cases, these states were simply overthrown by nationalist uprisings in the 19th century. Liberal ideas of free trade played a role in German unification, which was preceded by a customs union, the Zollverein. However, the Austro-Prussian War, and the German alliances in the Franco-Prussian War, were decisive in the unification. The Austro-Hungarian Empire and the Ottoman Empire broke up after the First World War, and the Russian Empire became the Soviet Union after the Russian Civil War.

A few of the smaller states survived: the independent principalities of Liechtenstein, Andorra, Monaco, and the republic of San Marino. (Vatican City is a special case. All of the larger Papal States save the Vatican itself were occupied and absorbed by Italy by 1870. The resulting Roman Question was resolved with the rise of the modern state under the 1929 Lateran treaties between Italy and the Holy See.)

Characteristics

"Legitimate states that govern effectively and dynamic industrial economies are widely regarded today as the defining characteristics of a modern nation-state."

Nation states have their own characteristics, differing from those of the pre-national states. For a start, they have a different attitude to their territory when compared with dynastic monarchies: it is semisacred and nontransferable. No nation would swap territory with other states simply, for example, because the king's daughter married. They have a different type of border, in principle defined only by the area of settlement of the national group, although many nation states also sought natural borders (rivers, mountain ranges). They are constantly changing in population size and power because of the limited restrictions of their borders.

The most noticeable characteristic is the degree to which nation states use the state as an instrument of national unity, in economic, social and cultural life.

The nation state promoted economic unity, by abolishing internal customs and tolls. In Germany, that process, the creation of the Zollverein, preceded formal national unity. Nation states typically have a policy to create and maintain a national transportation infrastructure, facilitating trade and travel. In 19th-century Europe, the expansion of the rail transport networks was at first largely a matter for private railway companies, but gradually came under control of the national governments. The French rail network, with its main lines radiating from Paris to all corners of France, is often seen as a reflection of the centralised French nation state, which directed its construction. Nation states continue to build, for instance, specifically national motorway networks. Specifically transnational infrastructure programmes, such as the Trans-European Networks, are a recent innovation.

The nation states typically had a more centralised and uniform public administration than its imperial predecessors: they were smaller, and the population less diverse. (The internal diversity of the Ottoman Empire, for instance, was very great.) After the 19th-century triumph of the nation state in Europe, regional identity was subordinate to national identity, in regions such as Alsace-Lorraine, Catalonia, Brittany and Corsica. In many cases, the regional administration was also subordinated to central (national) government. This process was partially reversed from the 1970s onward, with the introduction of various forms of regional autonomy, in formerly centralised states such as Spain or Italy.

The most obvious impact of the nation state, as compared to its non-national predecessors, is the creation of a uniform national culture, through state policy. The model of the nation state implies that its population constitutes a nation, united by a common descent, a common language and many forms of shared culture. When the implied unity was absent, the nation state often tried to create it. It promoted a uniform national language, through language policy. The creation of national systems of compulsory primary education and a relatively uniform curriculum in secondary schools, was the most effective instrument in the spread of the national languages. The schools also taught the national history, often in a propagandistic and mythologised version, and (especially during conflicts) some nation states still teach this kind of history.

Language and cultural policy was sometimes negative, aimed at the suppression of non-national elements. Language prohibitions were sometimes used to accelerate the adoption of national languages and the decline of minority languages (see examples: Anglicisation, Bulgarization, Croatization, Czechization, Dutchification, Francisation, Germanisation, Hellenization, Hispanicization, Italianization, Lithuanization, Magyarisation, Polonisation, Russification, Serbization, Slovakisation, Swedification, Turkification).

In some cases, these policies triggered bitter conflicts and further ethnic separatism. But where it worked, the cultural uniformity and homogeneity of the population increased. Conversely, the cultural divergence at the border became sharper: in theory, a uniform French identity extends from the Atlantic coast to the Rhine, and on the other bank of the Rhine, a uniform German identity begins. To enforce that model, both sides have divergent language policy and educational systems.

In practice

See also: Monoethnicity

The notion of a unifying "national identity" also extends to countries that host multiple ethnic or language groups, such as India. For example, Switzerland is constitutionally a confederation of cantons, and has four official languages, but it has also a "Swiss" national identity, a national history and a classic national hero, Wilhelm Tell.

Innumerable conflicts have arisen where political boundaries did not correspond with ethnic or cultural boundaries.

After World War II in the Josip Broz Tito era, nationalism was appealed to for uniting South Slav peoples. Later in the 20th century, after the break-up of the Soviet Union, leaders appealed to ancient ethnic feuds or tensions that ignited conflict between the Serbs, Croats and Slovenes, as well as Bosniaks, Montenegrins and Macedonians, eventually breaking up the long collaboration of peoples. Ethnic cleansing was carried out in the Balkans, resulting in the destruction of the formerly socialist republic and producing the civil wars in Croatia and Bosnia and Herzegovina in 1992–95, resulting in mass population displacements and segregation that radically altered what was once a highly diverse and intermixed ethnic makeup of the region. These conflicts were largely about creating a new political framework of states, each of which would be ethnically and politically homogeneous. Serbs, Croats and Bosniaks insisted they were ethnically distinct although many communities had a long history of intermarriage. Presently Croatia (90,42%), Slovenia (83,1-88%) and Serbia (83,3% Serb) could be classified as monoethnic states, whereas North Macedonia (66% Macedonian), Montenegro (42% Montenegrin) and Bosnia and Herzegovina (50.1% Bosniak) are multiethnic states.

Belgium is a classic example of a state that is not a nation state. The state was formed by secession from the United Kingdom of the Netherlands in 1830, whose neutrality and integrity was protected by the Treaty of London 1839; thus it served as a buffer state after the Napoleonic Wars between the European powers France, Prussia (after 1871 the German Empire) and the United Kingdom until World War I, when its neutrality was breached by the Germans. Currently, Belgium is divided between the Flemings in the north, the French-speaking population in the south, and the German-speaking population in the east. The Flemish population in the north speaks Dutch, the Walloon population in the south speaks either French or, in the east of Liège Province, German. The Brussels population speaks French or Dutch.

The Flemish identity is also cultural, and there is a strong separatist movement espoused by the political parties, the right-wing Vlaams Belang and the Nieuw-Vlaamse Alliantie. The Francophone Walloon identity of Belgium is linguistically distinct and regionalist. There is also unitary Belgian nationalism, several versions of a Greater Netherlands ideal, and a German-speaking community of Belgium annexed from Germany in 1920, and re-annexed by Germany in 1940–1944. However, these ideologies are all very marginal and politically insignificant during elections.

Ethnolinguistic map of mainland China and Taiwan

China covers a large geographic area and uses the concept of "Zhonghua minzu" or Chinese nationality, in the sense of ethnic groups, but it also officially recognizes the majority Han ethnic group which accounts for over 90% of the population, and no fewer than 55 ethnic national minorities.

According to Philip G. Roeder, Moldova is an example of a Soviet era "segment-state" (Moldavian SSR), where the "nation-state project of the segment-state trumped the nation-state project of prior statehood. In Moldova, despite strong agitation from university faculty and students for reunification with Romania, the nation-state project forged within the Moldavian SSR trumped the project for a return to the interwar nation-state project of Greater Romania." See Controversy over linguistic and ethnic identity in Moldova for further details.

Exceptional cases

Israel

Israel was founded as a Jewish state in 1948. Its "Basic Laws" describe it as both a Jewish and a democratic state. The Basic Law: Israel as the Nation-State of the Jewish People (2018) explicitly specifies the nature of the State of Israel as the nation-state of the Jewish people. According to the Israel Central Bureau of Statistics, 75.7% of Israel's population are Jews. Arabs, who make up 20.4% of the population, are the largest ethnic minority in Israel. Israel also has very small communities of Armenians, Circassians, Assyrians, Samaritans. There are also some non-Jewish spouses of Israeli Jews. However, these communities are very small, and usually number only in the hundreds or thousands.

Kingdom of the Netherlands

The Kingdom of the Netherlands presents an unusual example in which one kingdom represents four distinct countries. The four countries of the Kingdom of the Netherlands are:

• Netherlands (including the provinces in continental Europe and the special municipalities of Bonaire, Sint Eustatius and Saba)
• Aruba
• Curaçao
• Sint Maarten

Each is expressly designated as a land in Dutch law by the Charter for the Kingdom of the Netherlands. Unlike the German Länder and the Austrian Bundesländer, landen is consistently translated as "countries" by the Dutch government.

Pakistan

Pakistan, even being an ethnically diverse country and officially a federation, is regarded as a nation state due to its ideological basis on which it was given independence from British India as a separate nation rather than as part of a unified India. Different ethnic groups in Pakistan are strongly bonded by their common Muslim identity, common cultural and social values, common historical heritage, a national lingua franca (Urdu) and joint political, strategic and economic interests.

Spain

While historical monarchies often brought together different kingdoms/territories/ethnic groups under the same crown, in modern nation states political elites seek a uniformity of the population, leading to state nationalism. In the case of the Christian territories of the future Spain, neighboring Al-Andalus, there was an early perception of ethnicity, faith and shared territory in the Middle Ages (13th-14th centuries), as documented by the Chronicle of Muntaner in the proposal of the Castilian king to the other Christian kings of the peninsula: "...if these four Kings of Spain whom he named, who are of one flesh and blood, held together, little need they fear all the other powers of the world...". After the dynastic union of the Catholic Monarchs in the 15th century, the Spanish Monarchy ruled over different kingdoms, each with its own cultural, linguistic and political particularities, and the kings had to swear by the Laws of each territory before the respective Parliaments.

After the War of the Spanish Succession, rooted in the political position of the Count-Duke of Olivares and the absolutism of Philip V, the assimilation of the Crown of Aragon by the Castilian Crown through the Decrees of Nova planta was the first step in the creation of the Spanish nation-state. As in other contemporary European states, political union was the first step in the creation of the Spanish nation-state, in this case not on a uniform ethnic basis, but through the imposition of the political and cultural characteristics of the dominant ethnic group, in this case the Castilians, over those of other ethnic groups, who became national minorities to be assimilated. In fact, since the political unification of 1714, Spanish assimilation policies towards Catalan-speaking territories (Catalonia, Valencia, the Balearic Islands, part of Aragon) and other national minorities have been a historical constant.

School map of Spain from 1850. On it, the State is shown divided into four parts:- "Fully constitutional Spain", which includes Castile and Andalusia, but also the Galician-speaking territories. - "Annexed or assimilated Spain": the territories of the Crown of Aragon, the larger part of which, with the exception of Aragon proper, are Catalan-speaking-, "Foral Spain", which includes Basque-speaking territories-, and "Colonial Spain", with the last overseas colonial territories.

The process of assimilation began with secret instructions to the corregidores of the Catalan territory: they "will take the utmost care to introduce the Castilian language, for which purpose he will give the most temperate and disguised measures so that the effect is achieved, without the care being noticed." From there, actions in the service of assimilation, discreet or aggressive, were continued, and reached to the last detail, such as, in 1799, the Royal Certificate forbidding anyone to "represent, sing and dance pieces that were not in Spanish." These nationalist policies, sometimes very aggressive, and still in force, have been, and still are, the seed of repeated territorial conflicts within the State.

The nationalization process accelerated in the 19th century, in parallel to the origin of Spanish nationalism, the social, political and ideological movement that tried to shape a Spanish national identity based on the Castilian model, in conflict with the other historical nations of the State. Politicians of the time were aware that despite the aggressive policies pursued up to that time, the uniform and monocultural "Spanish nation" did not exist, as indicated in 1835 by Antonio Alcalà Galiano, when in the Cortes del Estatuto Real he defended the effort

"To make the Spanish nation a nation that neither is nor has been until now."

In 1906, the Catalanist party Solidaritat Catalana was founded to try to mitigate the economically and culturally oppressive treatment of Spain towards the Catalans. One of the responses of Spanish nationalism came from the military state with statements such as that of the publication La Correspondencia militar: "The Catalan problem is not solved, well, by freedom, but by restriction; not by palliatives and pacts, but by iron and fire". Another came from important Spanish intellectuals, such Pio Baroja and Blasco Ibañez, calling the Catalans "Jews", considered a serious insult at that time when racism was gaining strength. Building the nation (as in France, it was the state that created the nation, and not the opposite process) is an ideal that the Spanish elites constantly reiterated, and, one hundred years later than Alcalá Galiano, for example, we can also find it in the mouth of the fascist José Pemartín, who admired the German and Italian modeling policies:

"There is an intimate and decisive dualism, both in Italian fascism and in German National Socialism. On the one hand the Hegelian doctrine of the absolutism of the state is felt. The State originates in the Nation, educates and shapes the mentality of the individual; is, in Mussolini's words, the soul of the soul »

The turn of the 20th century, and the first half of that century, have seen the most ethnic violence, coinciding with a racism that even came to identify states with races; in the case of Spain, with a supposed Spanish race sublimated in Castilian, of which national minorities were degenerate forms, and the first of those that needed to be exterminated. In this sense, one can find discourses on the alienation of Catalan speakers, such as, for example, an article entitled «Cataluña bilingüe», by Menéndez Pidal, in which he defends the Romanones decree against the Catalan language, published in El Imparcial, on 15 December 1902:

«… There they will see that the Courts of the Catalan-Aragonese Confederation never had Catalan as their official language; that the kings of Aragon, even those of the Catalan dynasty, used Catalan only in Catalonia, and used Spanish not only in the Cortes of Aragon, but also in foreign relations, the same with Castile or Navarre as with the infidel kings of Granada , from Africa or Asia, because even in the most important days of Catalonia, Spanish prevailed as the language of the Aragonese kingdom and Catalan was reserved for the peculiar affairs of the Catalan county..."

or the article "Los Catalanes. A las Cortes Constituyentes », appeared in several newspapers, among others: El Dia de Alicante, June 23, 1931, El Porvenir Castellano and El Noticiero de Soria, July 2, 1931, in the Heraldo de Almeria on June 4, 1931, sent by the "Pro-Justice Committee", with a post office box in Madrid:

"The Catalanists have recently declared that they are not Spanish, nor do they want to be, nor can they be. They have also been saying for a long time that they are an oppressed, enslaved, exploited people. It is imperative to do them justice... That they return to Phenicia or that they go wherever they want to admit them. When the Catalan tribes saw Spain and settled in the Spanish territory that is now occupied by the provinces of Barcelona, Gerona, Lérida and Tarragona, how little they imagined that the case of the captivity of the tribes of Israel in Egypt would be repeated there! !... Let us respect his most holy will. They are eternally inadaptable... Their cowardice and selfishness leaves them no room for fraternity... So, we propose to the Constituent Cortes the expulsion of the Catalanists... You are free! The Republic opens wide the doors of Spain, your prison. go away Get out of here. Go back to Phenicia, or go wherever you want, how big is the world."

The main scapegoat of Spanish nationalism is the non-Spanish languages, which over the last three hundred years have been tried to be replaced by Spanish with hundreds of laws and regulations, but also with acts of great violence, such as during the civil war. For example, the statements of Queipo de Llano can be found in the article entitled "Against Catalonia, the Israel of the Modern World", published in the Diario Palentino on November 26, 1936, where it is dropped that in America Catalans are considered a race of Jews, because they use the same procedures that the Hebrews perform in all the nations of the Globe. And considering the Catalans as Hebrews and considering his anti-Semitism "Our struggle is not a civil war, but a war for Western civilization against the Jewish world," it is not surprising that Queipo de Llano expressed his anti-Catalan intentions: "When the war is over, Pompeu Fabra and his works will be dragged along the Ramblas" (it was not talk to talk, the house of Pompeu Fabra, the standardizer of Catalan language, was raided and his huge personal library burned in the middle of the street. Pompeu Fabra was able to escape into exile). Another example of fascist aggression towards the Catalan language is pointed out by Paul Preston in "The Spanish Holocaust", given that during the civil war it practically led to an ethnic conflict:

"In the days following the occupation of Lleida (…), the republican prisoners identified as Catalans were executed without trial. Anyone who heard them speak Catalan was very likely to be arrested. The arbitrary brutality of the anti-Catalan repression reached such a point that Franco himself had to issue an order ordering that mistakes that could later be regretted be avoided ". "There are examples of the murder of peasants for no other apparent reason than that of speaking Catalan"

After a possible attempt at ethnic cleansing, the biopolitical imposition of Spanish during the Franco dictatorship, to the point of being considered an attempt at cultural genocide, democracy consolidated an asymmetric regime of bilingualism, in what has progressively been woven a web of laws and aids that privigate Spanish against Catalan, which becomes the weak language of bilingualism, and therefore, in the absence of other states where it is spoken, is doomed to extinction in the medium or short term. In the same vein, its use in the Spanish Congress is prevented, and it is prevented from being official in Europe, unlike less spoken languages such as Gaelic. In other institutional areas, such as justice, Plataforma per la Llengua has denounced Catalanophobia. The association Soberania i Justícia have also denounced it in an act in the European Parliament.

In November 2005, Omnium Cultural organized a meeting of Catalan and Madrid intellectuals in the Círculo de bellas artes in Madrid to show support for ongoing reform of Catalan Statute of Autonomy, which sought to resolve territorial tensions, and among other things better protect the Catalan language. On the Catalan side, a flight was made with one hundred representatives of the cultural, civic, intellectual, artistic and sporting world of Catalonia, but on the Spanish side, except Santiago Carrillo, a politician from the Second Republic, did not attend any more. The subsequent failure of the statutory reform with respect to its objectives opened the door to the growth of Catalan sovereignty.

Apart from language discrimination by public officials, e.g. in the hospitals, the current prohibition of using the Catalan language in state institutions such as Court, despite being the former Crown of Aragon, with three Catalan-speaking territories, one of the co-founders of the current Spanish state, is nothing more than the continuation of the foreignization of Catalan-speaking people from the first third of the 20th century, in full swing of state racism and fascism. It also can be pointed the linguistic secessionism, originally advocated by the Spanish far right and which has finally been adopted by the Spanish government itself and state bodies. By fragmenting Catalan language into as many languages as territories, it becomes inoperative, economically suffocated, and becomes a political toy in the hands of territorial politicians.

Susceptible to be classified as an ethnic democracy, the Spanish State currently only recognizes the gypsies as a national minority, excluding Catalans (and, of course, Valencians and Balearic), Basques and Galicians. However, it is evident to any external observer that there are social diversities within the Spanish State that qualify as manifestations of national minorities, such as, for example, the existence of the main three linguistic minorities in their ancestral territories.

United Kingdom

England

Scotland

Northern Ireland

Wales

Home Nations of the United Kingdom

The United Kingdom is an unusual example of a nation state due to its "countries within a country". The United Kingdom is formed by the union of England, Scotland, Wales and Northern Ireland, but it is a unitary state formed initially by the merger of two independent kingdoms, the Kingdom of England (which already included Wales) and the Kingdom of Scotland, but the Treaty of Union (1707) that set out the agreed terms has ensured the continuation of distinct features of each state, including separate legal systems and separate national churches.

In 2003, the British Government described the United Kingdom as "countries within a country". While the Office for National Statistics and others describe the United Kingdom as a "nation state", others, including a then Prime Minister, describe it as a "multinational state", and the term Home Nations is used to describe the four national teams that represent the four nations of the United Kingdom (England, Northern Ireland, Scotland, Wales). Some refer to it as a "Union State".

There has been academic debate over whether the United Kingdom can be legally dissolved, as it is recognized internationally as a single nation state. English law jurist A.V. Dicey wrote from an English legal perspective that the question is based on whether the legislation giving rise to the union (the Union with Scotland Act), one of the two pieces of legislation which created the state, can be repealed. Dicey claimed because the Law of England does not acknowledge the word "unconstitutional", as a matter of English law it can be repealed. He also stated any tampering with the Acts of Union 1707 would be political madness.

Minorities

The most obvious deviation from the ideal of "one nation, one state" is the presence of minorities, especially ethnic minorities, which are clearly not members of the majority nation. An ethnic nationalist definition of a nation is necessarily exclusive: ethnic nations typically do not have open membership. In most cases, there is a clear idea that surrounding nations are different, and that includes members of those nations who live on the "wrong side" of the border. Historical examples of groups who have been specifically singled out as outsiders are the Roma and Jews in Europe.

Negative responses to minorities within the nation state have ranged from cultural assimilation enforced by the state, to expulsion, persecution, violence, and extermination. The assimilation policies are usually enforced by the state, but violence against minorities is not always state-initiated: it can occur in the form of mob violence such as lynching or pogroms. Nation states are responsible for some of the worst historical examples of violence against minorities not considered part of the nation.

However, many nation states accept specific minorities as being part of the nation, and the term national minority is often used in this sense. The Sorbs in Germany are an example: for centuries they have lived in German-speaking states, surrounded by a much larger ethnic German population, and they have no other historical territory. They are now generally considered to be part of the German nation and are accepted as such by the Federal Republic of Germany, which constitutionally guarantees their cultural rights. Of the thousands of ethnic and cultural minorities in nation states across the world, only a few have this level of acceptance and protection.

Multiculturalism is an official policy in some states, establishing the ideal of coexisting existence among multiple and separate ethnic, cultural, and linguistic groups. Other states preffer the interculturalism (or "melting pot" approach) alternative to multiculturalism, citing problems with latter as promoting self-segregation tendencies among minority groups, challenging national cohesion, polarizing society in groups that can't relate to one another, generating problems in regard to minorities and immigrants' fluency in the national language of use and integration with the rest of society (generating hate and persecution against them from the "otherness" they would generate in such a case according to its adherants), without minorities having to give up certain parts of their culture before being absorbed into a now changed majority culture by their contribution. Many nations have laws protecting minority rights.

When national boundaries that do not match ethnic boundaries are drawn, such as in the Balkans and Central Asia, ethnic tension, massacres and even genocide, sometimes has occurred historically (see Bosnian genocide and 2010 South Kyrgyzstan ethnic clashes).

Irredentism

Main article: Irredentism

 

The Greater German Reich under Nazi Germany in 1943

In principle, the border of a nation state would extend far enough to include all the members of the nation, and all of the national homeland. Again, in practice, some of them always live on the 'wrong side' of the border. Part of the national homeland may be there too, and it may be governed by the 'wrong' nation. The response to the non-inclusion of territory and population may take the form of irredentism: demands to annex unredeemed territory and incorporate it into the nation state.

Irredentist claims are usually based on the fact that an identifiable part of the national group lives across the border. However, they can include claims to territory where no members of that nation live at present, because they lived there in the past, the national language is spoken in that region, the national culture has influenced it, geographical unity with the existing territory, or a wide variety of other reasons. Past grievances are usually involved and can cause revanchism.

It is sometimes difficult to distinguish irredentism from pan-nationalism, since both claim that all members of an ethnic and cultural nation belong in one specific state. Pan-nationalism is less likely to specify the nation ethnically. For instance, variants of Pan-Germanism have different ideas about what constituted Greater Germany, including the confusing term Grossdeutschland, which, in fact, implied the inclusion of huge Slavic minorities from the Austro-Hungarian Empire.

Typically, irredentist demands are at first made by members of non-state nationalist movements. When they are adopted by a state, they typically result in tensions, and actual attempts at annexation are always considered a casus belli, a cause for war. In many cases, such claims result in long-term hostile relations between neighbouring states. Irredentist movements typically circulate maps of the claimed national territory, the greater nation state. That territory, which is often much larger than the existing state, plays a central role in their propaganda.

Irredentism should not be confused with claims to overseas colonies, which are not generally considered part of the national homeland. Some French overseas colonies would be an exception: French rule in Algeria unsuccessfully treated the colony as a département of France.

Future

It has been speculated by both proponents of globalization and various science fiction writers that the concept of a nation state may disappear with the ever-increasing interconnectedness of the world. Such ideas are sometimes expressed around concepts of a world government. Another possibility is a societal collapse and move into communal anarchy or zero world government, in which nation states no longer exist.

Clash of civilizations

The theory of the clash of civilizations lies in direct contrast to cosmopolitan theories about an ever more connected world that no longer requires nation states. According to political scientist Samuel P. Huntington, people's cultural and religious identities will be the primary source of conflict in the post–Cold War world.

The theory was originally formulated in a 1992 lecture at the American Enterprise Institute, which was then developed in a 1993 Foreign Affairs article titled "The Clash of Civilizations?", in response to Francis Fukuyama's 1992 book, The End of History and the Last Man. Huntington later expanded his thesis in a 1996 book The Clash of Civilizations and the Remaking of World Order.

Huntington began his thinking by surveying the diverse theories about the nature of global politics in the post–Cold War period. Some theorists and writers argued that human rights, liberal democracy and capitalist free market economics had become the only remaining ideological alternative for nations in the post–Cold War world. Specifically, Francis Fukuyama, in The End of History and the Last Man, argued that the world had reached a Hegelian "end of history".

Huntington believed that while the age of ideology had ended, the world had reverted only to a normal state of affairs characterized by cultural conflict. In his thesis, he argued that the primary axis of conflict in the future will be along cultural and religious lines.

As an extension, he posits that the concept of different civilizations, as the highest rank of cultural identity, will become increasingly useful in analyzing the potential for conflict.

In the 1993 Foreign Affairs article, Huntington writes:

It is my hypothesis that the fundamental source of conflict in this new world will not be primarily ideological or primarily economic. The great divisions among humankind and the dominating source of conflict will be cultural. Nation states will remain the most powerful actors in world affairs, but the principal conflicts of global politics will occur between nations and groups of different civilizations. The clash of civilizations will dominate global politics. The fault lines between civilizations will be the battle lines of the future.

Sandra Joireman suggests that Huntington may be characterised as a neo-primordialist, as, while he sees people as having strong ties to their ethnicity, he does not believe that these ties have always existed.

Historiography

Historians often look to the past to find the origins of a particular nation state. Indeed, they often put so much emphasis on the importance of the nation state in modern times, that they distort the history of earlier periods in order to emphasize the question of origins. Lansing and English argue that much of the medieval history of Europe was structured to follow the historical winners—especially the nation states that emerged around Paris and London. Important developments that did not directly lead to a nation state get neglected, they argue:

one effect of this approach has been to privilege historical winners, aspects of medieval Europe that became important in later centuries, above all the nation state.... Arguably the liveliest cultural innovation in the 13th century was the Mediterranean, centered on Frederick II's polyglot court and administration in Palermo...Sicily and the Italian South in later centuries suffered a long slide into overtaxed poverty and marginality. Textbook narratives, therefore, focus not on medieval Palermo, with its Muslim and Jewish bureaucracies and Arabic-speaking monarch, but on the historical winners, Paris and London.