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So, we all know the standard TL 191 course of events where the CSA goes fascist and starts slaughtering is black population.
I have always thought that after a defeat in the ACW the USA could take a rather nasty turn. I could imagine a strong political faction in the USA that hates blacks and Jews because they split the country (remember Judah P. Benjamin). I could also imagine that party having a great deal of influence if not outright power.
There have always been strong nativist tendencies in American politics and a certain preference for the paranoid style amongst the right.