I asked someone on this thread, this question already. But now I’m asking you it.
Are u aware that the parties switched?
They changed and evolved over time. It wasn't like it was a sudden switch.
Some views of the Republicans have been the same since the Civil War. They were always pro-capitalist, pro-business - yet more favorable to Northern industry rather than Southern agrarianism. But they were still staunchly socially conservative, which gave them their strength in the central and northern Bible Belt regions, where they still dominate today. They were also ardently patriotic, as was the period between the Civil War and WW1.
The Democrats were in a weakened position after the Civil War, although in the North, the Republican-dominated industries were starting to face opposition from organized labor and others who had a more progressive view of the world. The cities in that time were in pretty rough shape - crowded tenements, horrid living conditions, raw sewage running down the streets, rats, disease, crime. There were also plenty of new immigrants who didn't fit in to the "wasp" image that the Republicans presented. So, the Democrats gained greater strength in the North.
The Republicans also faced a minor rift when Teddy Roosevelt ran as a Progressive in 1912, which split the Republican vote and led to Wilson's election. Wilson's and Roosevelt's platforms were actually not that much different from each other. But the major shift occurred at the onset of the Great Depression, which was blamed on the Republicans and led to a 20-year period of mostly Democratic rule.
So, the Republicans had to reinvent themselves, at least in some ways. Isolationism (as it was called) was at an end. Republicans in the post-war era tended more towards an internationalist view, similar to what FDR and Truman were supporting. However, they went even more intense when it came to anti-communism, criticizing the Democrats for being "too soft" on communism. This also led to a certain level of alienation of various progressive and liberal Democrats whose views seemed a little too "socialistic" for the right-wingers' taste.
And this is also the same time that the Dixiecrats started to make louder noises as they split from the party. But one thing to keep in mind is that the South was/is not a monolithic region. They weren't all such fans of George Wallace, although their last gasp might have been in '68, when the Democrats were teetering on self-destruction. Not just due to the Dixiecrats, but also due to the internal schisms between the anti-war progressives and the pro-war moderates.
But either way, Wallace and the overtly racist agenda of the Dixiecrats was at an end. Anyone who had such an agenda would no longer find a home in the Democratic Party. The new southern Democrats would be moderates like Carter and Clinton.
The Republicans maintained their ultra-patriotic, god-fearing bent and attracted many in the southern Bible Belt. They were also more pro-war, while the Democrats were associated with being anti-war. However, both parties fostered similar perceptions of the world and held similar foreign policy goals - even if there has been slight disagreement over how to achieve those goals.
The Democrats also shifted somewhat, moving away from being the party of the working man. They also moderated their anti-war viewpoints they were often associated with. On economic issues, they're more like the Republicans than they're different - only slight shades of difference between them.
On paper, there's nothing inherent in either party, not in their actual names or anything, that makes them what they are. If all the Republicans and Democrats suddenly changed places and switched, it would be kind of weird, but I think both sides would adjust to their new names rather quickly.