AHC challenge: Safe Republican NE, Safe Democratic Deep South

Your challenge is to create or envision a scenario with a PoD of no ealier than 1960 where New England votes safely Republican and the Deep South votes safely Democratic. Other regions can go any which way according to your scenario, but New England and the Deep South must vote safely Republican and Democratic respectively.
 
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Best I can think of is having the Dems dominated by all-out Dixiecrats for an unrealistically long time.
 
Nixon wins in 1960 and re-elected in 1964. The Republicans become the party of socially conscious multi-racial white-collar professionals who generally favor lower taxes but are keen on some government programs that incentivize business start-ups, particularly amongst women and racial minorities. Strong in the Northeast and Pacific but with some strength in the South. The Democrats double-down and become socially conservative economic populists that are dominant in the South in addition to ethnic white working class voters in the Northeastern cities.
 
Nixon wins in 1960 and re-elected in 1964. The Republicans become the party of socially conscious multi-racial white-collar professionals who generally favor lower taxes but are keen on some government programs that incentivize business start-ups, particularly amongst women and racial minorities. Strong in the Northeast and Pacific but with some strength in the South. The Democrats double-down and become socially conservative economic populists that are dominant in the South in addition to ethnic white working class voters in the Northeastern cities.

Not enough. The Democratic Party was already losing the South (look at how close Texas was and how a bunch of Southern states went red in 1960) and Kennedy won much of the Northeast. I think for this to happen, you need to stop Hubert Humphrey's speech in 1948 from happening. Despite no split, Dewey steals the black vote from the Democrats. Dewey would be like a more socially liberal version of Eisenhower in the broad strokes and perhaps that would make the Republicans more socially liberal. At the same time, Truman's defeat may be deemed the result of his desegregation of the army, so then the Democrats become more socially conservative as a result.

A southern Democrat (maybe Al Gore Sr.) wins in 1956 and wins two terms, but does nothing in terms of civil rights. Subsequently, George Romney is elected in 1964 and passes as much civil rights legislation as LBJ and doubles down on social liberalism. This kills the Republican Party in the South while reinforcing its hold in the Northeast.
 
What do the Democrats do in terms of civil rights then?

Something like OTL Republicans (oppose further legislation and enforcement of existing policy). Maybe some southerner like John Connally is elected as part of a counterreaction to Romney's reforms and doubles down on opposition to busing and that stuff.
 
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