White supremacy or white supremacism is a racist ideology centered upon the belief, and the promotion of the belief, that white people are superior in certain characteristics, traits, and attributes to people of other racial backgrounds and that therefore white people should politically, economically and socially rule non-white people. White supremacy has roots in scientific racism and often relies on pseudoscientific arguments for portray white superiority.
The term is also typically used to describe a political ideology that perpetuates and maintains the social, political, historical and/or industrial domination by white people (as evidenced by historical and contemporary sociopolitical structures such as the Atlantic slave trade, Jim Crow laws in the United States, and apartheid in South Africa). Different forms of white supremacism put forth different conceptions of who is considered white, and different white supremacists identify various racial and cultural groups as their primary enemy. White supremacist groups have typically opposed people of color and Jews.
In academic usage, particularly in usage drawing on critical race theory, the term "white supremacy" can also refer to a political or socio-economic system where white people enjoy a structural advantage (privilege) over other ethnic groups, both at a collective and an individual level.