Practice of restricting people to certain circumscribed areas of residence or to separate institutions and facilities on the basis of race or alleged race. Racial segregation provides a means of maintaining the economic advantages and higher social status of politically dominant races. Historically, various conquerors—among them Asian Mongols, African Bantu, and American Aztecs—have practiced discrimination involving the segregation of subject races. Racial segregation has appeared in all multiracial communities, except where racial amalgamation has occurred on a large scale, as in Hawaii and Brazil. In such places there has been occasional social discrimination but not legal segregation. In the Southern states of the U.S., public facilities were segregated from the late 19th century into the 1950s (see Jim Crow law), and in South Africa a system of apartheid sanctioned discrimination against nonwhites until it was abolished in the 1990s. The U.S. civil rights movement and Civil Rights Act of 1964 helped end racial segregation in education and public facilities, though other forms of racial discrimination continued.

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Any action, practice, or belief that reflects the racial worldview—the ideology that humans are divided into separate and exclusive biological entities called “races,” that there is a causal link between inherited physical traits and traits of personality, intellect, morality, and other cultural behavioral features, and that some “races” are innately superior to others. Racism was at the heart of North American slavery and the overseas colonization and empire-building activities of some western Europeans, especially in the 18th century. The idea of race was invented to magnify the differences between people of European origin in the U.S. and those of African descent whose ancestors had been brought against their will to function as slaves in the American South. By viewing Africans and their descendants as lesser human beings, the proponents of slavery attempted to justify and maintain this system of exploitation while at the same time portraying the U.S. as a bastion and champion of human freedom, with human rights, democratic institutions, unlimited opportunities, and equality. The contradiction between slavery and the ideology of human equality, accompanying a philosophy of human freedom and dignity, seemed to demand the dehumanization of those enslaved. By the 19th century racism had matured and the idea spread around the world. Racism differs from ethnocentrism in that it is linked to physical and therefore immutable differences among people. Ethnic identity is acquired, and ethnic features are learned forms of behaviour. Race, on the other hand, is a form of identity that is perceived as innate and unalterable. In the last half of the 20th century several conflicts around the world were interpreted in racial terms even though their origins were in the ethnic hostilities that have long characterized many human societies (e.g., Arabs and Jews, English and Irish). Racism reflects an acceptance of the deepest forms and degrees of divisiveness and carries the implication that differences among groups are so great that they cannot be transcended. Seealso ethnic group; sociocultural evolution.

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