...the Dixiecrats went over to the GOP.
Many things have changed since 1865.
Frankly, I wish there were some way to dissolve both the Republican and Democratic parties, ban anyone from ever using those as party names again, and ban anyone claiming spiritual descent from either party, and let all those suddenly partyless people hold long converstations to determine who has what in common from a political philosophy standpoint and let them form new parties (if they absolutely can't resist the urge) along those lines.
To accompany this I'd like the idea of governments conducting and paying for party primaries to become absolutely unthinkable, and for voting to be changed to getting to vote for or against every candidate, or abstain, so they get a -1, a 0, or a +1, with the highest total greater than 0 being the winner.