My dad has always said by 2020 or so, the Mississippi Legislature will consist of two things: white Republicans and black Democrats. He's probably right.
Unfortunately, there will always be some districts that are in the sweet spot for a White Democrat: Black percentage in the low forties.
Why is that unfortunate?
Because, as a partisan Republican, he wants the Democratic Party to look as black as possible in all southern states. Kind of like how many partisan Democrats want the Republican Party to look as Fundamentalist as possible, generally.