Earlier quoted context omitted.
Democrats (the South) always said that this country was always about slavery. They used that rhetoric to argue FOR slavery for decades after it was abolished. This is all documented in supreme court cases from the 18th century on up through the civil war. Some of the founding fathers argued as attorneys in some of those cases in fact, stating firmly that slavery was always illegal in the United States. Republicans (L…
You can’t talk about this Republican/Democrat dichotomy over 150 years without acknowledging party realignment. Are you familiar with it? Let me ask you this: what party did Strom Thurman swap to and why?
Republicans say they absolutely did, just as they always have.
Democrats say they absolutely didn't, just as they always have.
I would argue that realignment occurred geographically, not on the basis of morality. Under slavery, the southern states were rich and mostly Democrats, now the northern states are more largely rich and leaning Democrat. That's to be expected, I think, where the wealthy wouldn't enjoy the new found poverty of the southern states as they rebuilt after the war, and would take their ideals with them. But that's just my guess, I don't have any research to substantiate that. Maybe it's an interesting topic for research.
Similarly, the stance on issues of whether people are naturally born inferior and deserving of special treatment, good or bad, remains a largely Democrat ideology, just as it always has.
Republicans on the other hand argue that all man is created equal not equitable, and they used that rhetoric to free slaves, stop Jim Crow era horrors, etc. And they continue to use it to argue against race based government aid.
So on these specific topics, I don't see any realignment as objectively observed.
All of this was and is documented in many SCOTUS cases, old and new.