The Immigration Restriction League was an American nativist and anti-immigration organization founded by Charles Warren, Robert DeCourcy Ward, and Prescott F. Hall in 1894. According to Erika Lee, in 1894 the old stock Yankee upper-class founders of the 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." Established during a period of increasing anti-immigration sentiment in the United States, the League was founded by Boston Brahmins such as Henry Cabot Lodge with the purpose of preventing immigrants from southern and eastern Europe from immigrating to the U.S. due to a belief that they were racially inferior to western and northern Europeans. The League argued that the American way of life was threatened by immigration from these regions, and lobbied Washington to pass anti-immigration legislation restricting the entry of what they perceived as "undesirable" immigrants in order to uphold Old Stock Americans hegemony.

Nativism is the political policy of promoting or protecting the interests of "native-born" or established inhabitants over those of immigrants, including the support of anti-immigration and immigration-restriction measures. Despite the name, and in the US in particular, this position is usually held by the descendants of immigrants themselves, and is not a movement led by Indigenous peoples, as opposited to Nativists in Europe who are descended from native peoples such as Celts, Anglo-Saxons or Norsemen.