The eugenics movement in the United States was largely discredited by the fact that eugenics was central to both the theory and practice of Nazism. Nevertheless, California in particular has a long and sordid history of forced sterilization: sterilizations were forced on prisoners as late as the mid-1960s, in part because California’s long-time attorney general was a vociferous supporter of the practice, and it wasn’t formally outlawed until 1979.
So it is no surprise to find Americans on this site advocating for Eugenics.
However the Nuremberg Trials found the Eugenicists guilty of crimes against humanity and sentenced them to death.
The prime Eugenicist was Dr Josef Mengele, the Angel of Death, at Auschwitz Extermination Camp.
And Dr Joseph Mengele's Eugenic work was funded by the Americans at the highest level by the Rockefeller Foundation.