White supremacy or white supremacism is the belief that white people are superior to those of other races and thus should dominate them. The belief favors the maintenance and defense of white power and privilege. White supremacy has roots in the now-discredited doctrine of scientific racism, and was a key justification for European colonialism. It underlies a spectrum of contemporary movements including neo-Confederates, neo-Nazism and the so-called Christian Identity movement.
Different forms of white supremacy put forth different conceptions of who is considered white (though the exemplar is generally light-skinned, blond-haired, and blue-eyed, or 'Aryan' traits most common in northern Europe), and groups of white supremacists identify various racial, ethnic and religious enemies, most commonly those of Sub-Saharan African ancestry, Indigenous peoples of the Americas and Oceania, Asians, multiracial people, Middle Eastern people, Jews, Muslims, Hindus and Sikhs.
As a political ideology, it imposes and maintains social, political, historical, or institutional domination by white people. This ideology has been put into effect through socioeconomic and legal structures such as the Atlantic slave trade, Jim Crow laws in the United States, the White Australia policies from the 1890s to the mid-1970s, and apartheid in South Africa. In addition, this ideology is embodied in the "White power" social movement. Since the early 1980s, the White power movement has been committed to overthrowing the United States government and establishing a white ethnostate using paramilitary tactics.
In academic usage, particularly in critical race theory or intersectionality, "white supremacy" can also refer to a social system in which white people enjoy structural advantages (privilege) over other ethnic groups, on both a collective and individual level, despite formal legal equality.
In the USA in 1993 it was reported that increasing numbers of white supremacists are forsaking local action, such as cross burning, to build larger, mainstream constituencies, notably through satellite television. One such programme is broadcast over 65 local cable channels. White supremacist views include advocacy of the the death penalty for homosexuals, anti-semitism (quotations from the Protocols of the Elders of Zion), and opposition to racial integration as a sin. It is alleged to be a violent sub-culture and a vanguard political cause. Such groups tend to have sympathies with neo-Nazi and right-wing radical movements.