As Johnson signed the Civil Rights Act into law on July 2, 1964, he put down his pen and told an aide, "We have lost the South for a generation", anticipating a coming backlash from Southern whites.
And indeed, that's what happened (actually, more than a generation).
C'mon Man! Put down that "revisionist" history book.
It's just that simple...
PS - The South is STILL poor AND receives more in Federal monies than it pays in. Yes, it's true - you can even look it up (not that you will).