It began in England. Out of Darwinism. Once people had to accept that the Ancient Greek philosophies of “the ideal form” couldn’t exist. (Because of evolution, everything is always evolving) But you could use Darwin and Mendel and genetics to engineer the biology you preferred.
Also the popularity of eugenics began in the US. You even read about it in The Great Gatsby.
It began in England. Out of Darwinism. Once people had to accept that the Ancient Greek philosophies of “the ideal form” couldn’t exist. (Because of evolution, everything is always evolving) But you could use Darwin and Mendel and genetics to engineer the biology you preferred.