Eugenics was once a popular school in the United States in the first half of the 20th century. In the cold spring laboratory, Davenport used his eugenics theory and investigation report to lobby American consortia and the government to use IQ tests to stratify the population, and unqualified people will be forced to be sterilized. Since the 1920s, the US government has raised the threshold for Eastern European and Jewish immigrants, and the logic behind it is also derived from the genetic theory of eugenics, lest the Nordic orthodox immigrant genes be "contaminated." this led to a large number of European Jews desperate in the 1930s and died in Nazi concentration camps. This set of eugenics, based on the concept of racial purification, was also inherited and carried forward by the German Nazis. However, the total unemployment caused by the Great Depression destroyed the eugenics myth, the exposure of the Hollywood film "the Children of tomorrow" and the dark inside story of forced sterilization, and the spread of the horrific picture of the Nazi extermination camp at the end of World War II. Eugenics in the United States gradually declined after the 1940s, but state laws on forced sterilization were not abolished until the 1960s and 1970s.
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