Not sure where to go from here. If there's a good way to find out who among Trump's followers have ties to Christian Identity. And how to tie it to the Eugenics movement that started in England and moved to America in the late 19th and early to mid 20th centuries. A movement that definitely identified northern white Europeans as superior to everyone else. Gee, I wonder why. It couldn't be because white, male Northern Europeans came up with this load of BS.
For now recommend The War against the Weak by Edwin Black. It is a tough read. Not because it's poorly written. But, because the information will probably lead to an overwhelming urge to bounce the book off the walls. Repeatedly.