Donald Sterling got paid for a team he owned. He didn't want to give it up, and he could have made much more than 2 billion dollars off of it over time if he kept it. You're making it seem like he got paid for being a racist. lol He didn't. He got forced out of ownership against his will.
I'm not sure what your point about the Civil War is. Yes, Lincoln's desire in going to war was to preserve the Union, but why do you think he had to go to war to preserve the Union? Because slavery as an institution was causing a divide in the country. Your whole point is that whites always band together against blacks. If that were really true, then there would have never been any beef over slavery, and we'd still be in chains today. Also, it's just plain false that the power in the South was surpassing the power in the North, but even if that was, you're still countering your own argument about white unity. Again, if your line of reasoning was true, whites would have found a way to work it out without freeing slaves and assisting blacks.
Societal change doesn't happen overnight. You think centuries of racist infrastructure could be torn down in 50 years? Come on man. Back then, CaCs could string you up for looking at a white woman, take pictures as a group around your dead body smiling, and no one in the picture would get in trouble. Back then cops wouldn't have to bother coming up with bullshit excuses to explain why they killed a black person. They could kill black people with impunity. No, shit is not perfect today, but progress doesn't disappear just because you choose not to acknowledge it.
And yes, you do have a misunderstanding about racism. Some things are opinion. Some things aren't. Racism as a concept has a factual start in this country and a factual reason for its implementation. When you act like poor whites getting better treatment by the judicial system is some sort of example of white unity, you are clearly showing that you don't understand what racism is in this country. If you understood its origins, you would never make that conclusion.