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https://en.wikipedia.org/wiki/Great_Replacement_conspiracy_theory_in_the_United_States

In the United States, the far-right Great Replacement conspiracy theory holds that political elites are purposefully seeking to increase the number of racial minorities to displace the white American population. Supporters have used the conspiracy theory as a populist (and often racist) canard to advocate anti-immigration policies, and to discredit politicians who they perceive as left-wing. The theory has generated strong support in many sectors of the Republican Party of the United States and has become a major issue of political debate. It also has stimulated violent reactionary responses, including mass murders. The name is derived from the Great Replacement theory promoted in Europe, and also has similarities to the white genocide conspiracy theory.

Similar views have their origins in American nativism around 1900. According to Erika Lee, in 1894 the old stock Yankee upper-class founders of the Immigration Restriction League were "convinced that Anglo-Saxon traditions, peoples, and culture were being drowned in a flood of racially inferior foreigners from Southern and Eastern Europe." The modern movement in favor of this conspiracy theory expanded with Gamergate in 2014, and has received significant attention following the 2017 Unite the Right rally.

Responding to demographic projections