What racial ideology and practice provided justification for subordination and elimination of various non-white races in the early 1900s?

Question

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Scientific racism was a common racial ideology and practice in the early 1900s that provided justification for the subordination and elimination of non-white races. It claimed that certain races were inherently superior or inferior based on supposed genetic and physical differences. This led to policies of segregation, discrimination, and even genocidal practices against non-white populations, particularly in Europe and the Americas.

What Racial Ideology and Practice Provided Justification for Subordination and Elimination