The ideas of racial hygiene and eugenics certainly drew upon American science of the time, as well as German archaeology and anthropology. Their racial policies

The ideas of racial hygiene and eugenics certainly drew upon American science of the time, as well as German archaeology and anthropology. Their racial policies carried forward the ideas of American eugenics to its extreme but logical conclusion. To the extent that British were frowned upon, it was because of the presence of genetic contributions from the pre Yamnaya/Caucasian indigenous population. I remember there was a PBS American Experience: Eugenics episode that covered the Nazi party inspiration from American racial science.