I'd say it was moreso the concessions of things like letting racist piles of shit back into congress almost as soon as the war was over. If they had been treated like the untrustworthy shitstains that they clearly are, maybe they'd have eventually learned to appreciate why bigotry is bad. They should've had to earn equal rights. By willingly extending those rights to minorities before they themselves gained equal political rights.

Instead, we got decades and decades of Jim Crow/etc...