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Did a search and found some threads about the Republicans not pursuing a Southern Strategy after the passage of the Civil Rights Act and the Voting Rights Act but I can't find any threads about what would happen if legislature similar to the CRA and the VRA were passed under a Republican president.
Let's say that for whatever reason an anti-segregation Republican is president in the mid-60's and is able to pass civil rights legislation by getting the bulk of the Republican party on board as well as enough northern Democratic liberals to defeat the Dixiecrats and put a stake through Jim Crow.
This would produce a furious reaction from Dixiecrats, some defections from the Republicans in the south at least some northern democrats joining the Republicans and the bulk of new black voters supporting Republicans.
What would the long term effect of this be? Especially on the platforms of both parties in areas aside from civil rights?
I could see desegregation being rockier with it being spearheaded by a Republican instead of a southern Democrat like LBJ.
On the democratic side I could see civil rights tearing up the old New Deal coalition but the Dixiecrats wouldn't be able to defect and I could see labor having headaches about choosing between Dixiecrats or Rockefeller Republicans. What sort of economic policy would the Democrats go for if the Dixiecrats (and presumably the Reagan Democrats) stay on board? I could see the Democrats going strongly Pro-Life in order to keep northern Catholics on side in this universe (at this time Pro-Life was seen as mostly a Catholic issue, Evangelicals didn't make much of an issue out of it at the time).
For the Republicans this would presumably strengthen the hand of the Rockefeller Republicans with lots and lots and black voters voting in Republican primaries that'd have interesting repercussions. How far left in ways other than civil rights would the Republicans get pushed in this scenario? A lot of Nixon's domestic policies look pretty damn liberal compared to Reagan so presumably we'd see more of that, perhaps a stronger Earned Income Tax Credit?
In this universe would there be space for any third party? Perhaps an American labor and/or peace party?