The eugenics movement, rooted in 19th-century pseudo-scientific racism, influenced early 20th-century U.S. immigration policy, including the 1921 and 1924 quota acts that restricted immigration from Southern and Eastern Europe and Asia.
In the early 20th century, the eugenics movement, rooted in 19th-century pseudo-scientific racism, gained prominence, advocating immigration restrictions, racial segregation, and sterilization of perceived "unfit" groups. This influence can be seen in legislation such as the Emergency Quota Act of 1921, which restricted immigration from Eastern and Southern Europe, and the Johnson-Reed Immigration Act of 1924, which extended the ban on Asians, as well as the various state-level sterilization laws that mandated the sterilization of specific populations. Supported by the Carnegie Institute, Margaret Sanger, and the Nazis during World War II, eugenics left a significant mark on U.S. politics and world history.