What is the political system in which a few individuals usually military leaders rule the masses?

Here's a rundown of the various forms of government, with definitions provided by "The World Factbook." 

Absolute monarchy - a form of government where the monarch rules unhindered, i.e., without any laws, constitution or legally organized opposition.

Anarchy - a condition of lawlessness or political disorder brought about by the absence of governmental authority.

Authoritarian - a form of government in which state authority is imposed onto many aspects of citizens' lives.

Commonwealth - a nation, state or other political entity founded on law and united by a compact of the people for the common good.

Communist - a system of government in which the state plans and controls the economy and a single -- often authoritarian -- party holds power; state controls are imposed with the elimination of private ownership of property or capital while claiming to make progress toward a higher social order in which all goods are equally shared by the people (i.e., a classless society).

Confederacy (Confederation) - a union by compact or treaty between states, provinces or territories that creates a central government with limited powers; the constituent entities retain supreme authority over all matters except those delegated to the central government.

Constitutional - a government by or operating under an authoritative document (constitution) that sets forth the system of fundamental laws and principles that determines the nature, functions and limits of that government.

Constitutional democracy - a form of government in which the sovereign power of the people is spelled out in a governing constitution.

Constitutional monarchy - a system of government in which a monarch is guided by a constitution whereby his/her rights, duties, and responsibilities are spelled out in written law or by custom.

Democracy - a form of government in which the supreme power is retained by the people, but which is usually exercised indirectly through a system of representation and delegated authority periodically renewed.

Democratic republic - a state in which the supreme power rests in the body of citizens entitled to vote for officers and representatives responsible to them.

Dictatorship - a form of government in which a ruler or small clique wield absolute power (not restricted by a constitution or laws).

Ecclesiastical - a government administrated by a church.

Emirate - similar to a monarchy or sultanate, a government in which the supreme power is in the hands of an emir (the ruler of a Muslim state); the emir may be an absolute overlord or a sovereign with constitutionally limited authority.

Federal (Federation) - a form of government in which sovereign power is formally divided -- usually by means of a constitution -- between a central authority and a number of constituent regions (states, colonies or provinces) so that each region retains some management of its internal affairs; differs from a confederacy in that the central government exerts influence directly upon both individuals as well as upon the regional units.

Federal republic - a state in which the powers of the central government are restricted and in which the component parts (states, colonies, or provinces) retain a degree of self-government; ultimate sovereign power rests with the voters who chose their governmental representatives.

Islamic republic - a particular form of government adopted by some Muslim states; although such a state is, in theory, a theocracy, it remains a republic, but its laws are required to be compatible with the laws of Islam.

Maoism - the theory and practice of Marxism-Leninism developed in China by Mao Zedong (Mao Tse-tung), which states that a continuous revolution is necessary if the leaders of a communist state are to keep in touch with the people.

Marxism - the political, economic and social principles espoused by 19th century economist Karl Marx; he viewed the struggle of workers as a progression of historical forces that would proceed from a class struggle of the proletariat (workers) exploited by capitalists (business owners), to a socialist "dictatorship of the proletariat," to, finally, a classless society -- Communism.

Marxism-Leninism - an expanded form of communism developed by Vladimir Lenin from doctrines of Karl Marx; Lenin saw imperialism as the final stage of capitalism and shifted the focus of workers' struggle from developed to underdeveloped countries.

Monarchy - a government in which the supreme power is lodged in the hands of a monarch who reigns over a state or territory, usually for life and by hereditary right; the monarch may be either a sole absolute ruler or a sovereign - such as a king, queen or prince - with constitutionally limited authority.

Oligarchy - a government in which control is exercised by a small group of individuals whose authority generally is based on wealth or power.

Parliamentary democracy - a political system in which the legislature (parliament) selects the government - a prime minister, premier or chancellor along with the cabinet ministers - according to party strength as expressed in elections; by this system, the government acquires a dual responsibility: to the people as well as to the parliament.

Parliamentary government (Cabinet-Parliamentary government) - a government in which members of an executive branch (the cabinet and its leader - a prime minister, premier or chancellor) are nominated to their positions by a legislature or parliament, and are directly responsible to it; this type of government can be dissolved at will by the parliament (legislature) by means of a no-confidence vote or the leader of the cabinet may dissolve the parliament if it can no longer function.

Parliamentary monarchy - a state headed by a monarch who is not actively involved in policy formation or implementation (i.e., the exercise of sovereign powers by a monarch in a ceremonial capacity); true governmental leadership is carried out by a cabinet and its head - a prime minister, premier or chancellor - who are drawn from a legislature (parliament).

Presidential - a system of government where the executive branch exists separately from a legislature (to which it is generally not accountable).

Republic - a representative democracy in which the people's elected deputies (representatives), not the people themselves, vote on legislation.

Socialism - a government in which the means of planning, producing and distributing goods is controlled by a central government that theoretically seeks a more just and equitable distribution of property and labor; in actuality, most socialist governments have ended up being no more than dictatorships over workers by a ruling elite.

Sultanate - similar to a monarchy, a government in which the supreme power is in the hands of a sultan (the head of a Muslim state); the sultan may be an absolute ruler or a sovereign with constitutionally limited authority.

Theocracy - a form of government in which a Deity is recognized as the supreme civil ruler, the Deity's laws are interpreted by ecclesiastical authorities (bishops, mullahs, etc.); a government subject to religious authority.

Totalitarian - a government that seeks to subordinate the individual to the state by controlling not only all political and economic matters, but also the attitudes, values and beliefs of its population.

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Adolf Hitler and Benito Mussolini

While royal rule, as legitimized by blood descent, had almost vanished as an effective principle of government in the modern world, monocracy—a term that comprehends the rule of non-Western royal absolutists, of generals and strongmen in Latin America and Asia, of a number of leaders in postcolonial Africa, and of the totalitarian heads of communist states—still flourished. Indeed, the 20th century, which witnessed the careers of Atatürk, Benito Mussolini, Adolf Hitler, Joseph Stalin, Francisco Franco, Mao Tse-tung, Juan Perón, Tito, Gamal Abdel Nasser, Sukarno, Kwame Nkrumah, and Charles de Gaulle, could appear in history as the age of plebiscitary dictatorship.

In many of the states of Africa and Asia, for example, dictators quickly established themselves on the ruins of constitutional arrangements inherited from Western colonial powers. In some of these countries, presidents and prime ministers captured personal power by banning opposition parties and building replicas of the one-party systems of the communist world. In other new countries, the armies seized power, and military dictatorships were established. Whether as presidential dictatorships or as military dictatorships, the regimes that came into being appear to have had common roots in the social and economic problems of the new state. The constitutional systems inherited from the colonial powers proved unworkable in the absence of a strong middle class; local traditions of autocratic rule retained a powerful influence; the army, one of the few organized forces in society, was also often the only force capable of maintaining order; and a tiny intellectual class was impatient for economic progress, frustrated by the lack of opportunity, and deeply influenced by the example of authoritarianism in other countries. The dictatorships that resulted proved highly unstable, and few of the individual dictators were able to satisfy for long the demands of the different groups that supported their bids for power.

Although similar in some respects to the dictatorships of the new countries, the caudillos of 19th- and 20th-century Latin America represented a very different type of monocratic rule. In its 19th-century form, caudillismo was the result of the breakdown of central authority. After a brief period of constitutional rule, each of the former Spanish colonies in the Americas experienced a collapse of effective national government. A self-proclaimed leader, usually an army officer, heading a private army typically formed from the peasantry with the support of provincial landowners, established his control over one or more provinces, and then marched upon the national capital. The famous 19th-century caudillos—Antonio López de Santa Anna of Mexico or Juan Manuel de Rosas of Argentina, for example—were thus essentially provincial leaders who seized control of the national government to maintain the social and economic power of provincial groups. The 20th-century dictatorships in Latin American countries had different aims. The modern caudillo proved to be less a provincial leader than a national one. The Perón regime, for example, was established by nationalistic army officers committed to a program of national reform and ideological goals. Often, too, 20th-century dictators in Latin America allied themselves with a particular social class, attempting either to maintain the interests of established economic groupings or to press social reforms.

Dictatorship in the technologically advanced totalitarian regimes of modern fascism and communism was distinctively different from the authoritarian regimes of either Latin America or the postcolonial states of Africa and Asia. Nazi Germany under Hitler and the Soviet Union under Stalin are the leading examples of modern totalitarian dictatorships. The crucial elements of both were the identification of the state with the single mass party and of the party with its charismatic leader, the use of an official ideology to legitimize and maintain the regime, the employment of a terroristic police force and a controlled press, and the application of all the means of modern science and technology to control the economy and individual behaviour. The two systems, however, may be distinguished in several ways. Fascism, in its National Socialist form, was primarily a counterrevolutionary movement that mobilized middle- and lower middle-class groups to pursue nationalistic and militaristic goals and whose sole principle of organization was obedience to the Führer. By contrast, Soviet communism grew out of a revolutionary theory of society, pursued the goal of revolutionary overthrow of capitalist systems internationally, and employed the complex bureaucratic structures of the Communist Party as mechanisms of governmental organization.

Western constitutional democracies have provided examples of another type of contemporary dictatorship. At various points in the 20th and 21st centuries, during periods of domestic or foreign crisis, most constitutional regimes conferred emergency powers on the executive, suspending constitutional guarantees of individual rights or liberties or declaring some form of martial law. Indeed, the constitutions of some Western democracies explicitly provide for the grant of emergency powers to the executive in a time of crisis to protect the constitutional order. In many cases, of course, such provisions have been the instruments with which dictators have overthrown the regime. Thus, the proclamation of emergency rule was the beginning of the dictatorships of Mussolini in Italy, of Kemal Atatürk in Turkey, of Józef Piłsudski in Poland, of António de Olveira Salazar in Portugal, of Franz von Papen and Hitler in Germany, and of Engelbert Dollfuss and Kurt von Schuschnigg in Austria. In other democracies, however, constitutional arrangements have survived quite lengthy periods of crisis government. After World War II, for example, in both the United States and Britain, the use of extraordinary powers by the executive came to a halt with the end of the wartime emergency. Similarly, although the 1958 constitution of the Fifth Republic of France contained far-reaching emergency powers conferred on the president—“when the institutions of the Republic, the independence of the nation, the integrity of its territory or the fulfillment of its international obligations are threatened with immediate and grave danger, and when the regular functioning of the constitutional authority is interrupted”—their implicit threat to the constitutional order has not been realized.

Many forces at work in the late 20th and early 21st centuries have appeared to lend impetus to the rise of monocratic forms of rule. In nearly all political systems, the powers of chief executives have increased in response to the demanding social, economic, and military crises of the age. The complex decisions required of governments in a technological era, the perfectionist impulses of the great bureaucratic structures that have developed in all industrialized societies, and the imperatives of national survival in a nuclear world continue to add to the process of executive aggrandizement. The question for many constitutional regimes is whether the limitation and balance of power that are at the heart of constitutional government can survive the growing enlargement of executive power.

In the Aristotelian classification of government, there were two forms of rule by the few: aristocracy and its debased form, oligarchy. Although the term oligarchy is rarely used to refer to contemporary political systems, the phenomenon of irresponsible rule by small groups has not vanished from the world.

Many of the classical conditions of oligarchic rule were found until the 20th century in those parts of Asia in which governing elites were recruited exclusively from a ruling caste—a hereditary social grouping set apart from the rest of society by religion, kinship, economic status, prestige, and even language. In the contemporary world, in some countries that have not experienced the full impact of industrialization, governing elites are still often recruited from a ruling class—a stratum of society that monopolizes the chief social and economic functions in the system. Such elites have typically exercised power to maintain the economic and political status quo.

The simple forms of oligarchic rule associated with pre-industrial societies are, of course, rapidly disappearing. Industrialization produces new, differentiated elites that replace the small leadership groupings that once controlled social, economic, and political power in the society. The demands of industrialization compel recruitment on the basis of skill, merit, and achievement rather than on the basis of inherited social position and wealth. New forms of oligarchic rule have also made their appearance in many advanced industrial societies. Although governing elites in these societies are no longer recruited from a single class, they are often not subjected to effective restraints on the exercise of their power. Indeed, in some circumstances, the new elites may use their power to convert themselves into a governing class whose interests are protected by every agency of the state.

Oligarchic tendencies of a lesser degree have been detected in all the great bureaucratic structures of advanced political systems. The growing complexity of modern society and its government thrusts ever greater power into the hands of administrators and committees of experts. Even in constitutional regimes, no fully satisfactory answer has been found to the question of how these bureaucratic decision makers can be held accountable and their powers effectively restrained without, at the same time, jeopardizing the efficiency and rationality of the policy-making process.