The Nuremberg racial laws were particularly influenced by the laws implementing American anti-Black racism once the descendants of Africans abducted into enslavement were nominally free.
If you never want to sleep easy again, tour the section exploring how Germany went from fragile democracy into the state that was, within less than a decade, willing and able to systematically murder millions. Germans aren't special.
You might be interested to look a bit more at the history of the parties and how their conservative/progressive tendencies wax and wane over time. Saying the KKK was aligned with Democrats as not helpful without context of time.
Kevin Kruse (https://mobile.twitter.com/KevinMKruse) writes a lot about this, which is how I learned that in days gone by, I would have despised the state of the Democrats and embraced the Republicans - their policies were almost the total opposite of what you'd expect.
I take it you're not at all familiar with Richard Nixon's Southern Strategy, and it's embrace of the Dixiecrats, or actually quite a lot of relevant American political history
https://www.thenation.com/article/archive/exclusive-lee-atwa...