That's because the Democratic party turned whites against blacks for years. Now they have turned blacks against whites. Really, the Civil War was started because a bunch of ELITES wanted sucession so they could keep slavery, and so they rallied up the non-slave owning majority poor whites to go along with it. Which is VERY MUCH like today.
"Really, the Civil War was started because a bunch of ELITES wanted sucession so they could keep slavery"
Why would secession do that? Slavery was already legal according to the Constitution.