Benji, wait really?
1960
1964
1968
Literally, months after the 1964 Civil Rights Act the South did a 180.
What you don't get is that the South supported FDR and JFK because they had no problems with government programs and social safety nets. For the same reason they don't have a problem with Medicare and Social Security Today.
What changed after 1964 was that they viewed government programs as no longer going to them, but going to the blacks. And it no longer was about "the government should help us" but it became about "the government shouldn't steal our money to give to the blacks"
And a century of support for the Democratic Party at the Presidential level was erased overnight. Just as LBJ predicted. Which by the way, is the best thing that ever happened to the Democrats. Because the Republican problem is that they can't embrace the changing electorate without alienating their base and as long as they decide to keep their southern base happy, they'll lose presidential elections without voter ID and citizens united gimmicks.