You keep mentioning LBJ as the hero of the story, who only became president because the son of an anti-Semetic Hitler sycophant chose him to help capture the racist South. We know why LBJ pushed for the Civil Rights Act, which he referred to as "the nig_er bill":
"These Negroes, they’re getting pretty uppity these days and that’s a problem for us since they’ve got something now they never had before, the political pull to back up their uppityness. Now we’ve got to do something about this, we’ve got to give them a little something, just enough to quiet them down, not enough to make a difference. For if we don’t move at all, then their allies will line up against us and there’ll be no way of stopping them, we’ll lose the filibuster and there’ll be no way of putting a brake on all sorts of wild legislation. It’ll be Reconstruction all over again."
"I'll have those nig_ers voting Democratic for 200 years."