There's no doubt that ideas related to eugenics swept the world, from roughly 1890 to 1930, after which both the facts of science and evils inherent in human nature began to discredit assumptions underlying the word "eugenics".
However, once again, you are reading history backwards, this time from Auschwitz to Teddy Roosevelt's "New Nationalism", and that is neither good history nor fair to otherwise decent historical figures.
More bizarre items.
It is clear you have no idea of the rotten things the eugenicists did right here in the US during the Progressive Era, from the Kallikak Family, to the Jukes, and even Buck v. Bell. I read forward, which is why I know about Kallikak, Jukes, etc.
This would get easier if you stopped making assumptions and simply looked at what is being said.