I go back to these:

“If you can convince the lowest white man he's better than the best colored man, he won't notice you're picking his pocket. Hell, give him somebody to look down on, and he'll empty his pockets for you.”
― Lyndon B. Johnson

You start out in 1954 by saying, "Nigger, nigger, nigger". By 1968, you can't say "nigger"—that hurts you. Backfires. So you say stuff like forced busing, states' rights and all that stuff. You're getting so abstract now [that] you're talking about cutting taxes, and all these things you're talking about are totally economic things and a byproduct of them is [that] blacks get hurt worse than whites. And subconsciously maybe that is part of it. I'm not saying that. But I'm saying that if it is getting that abstract, and that coded, that we are doing away with the racial problem one way or the other. You follow me—because obviously sitting around saying, "We want to cut this", is much more abstract than even the busing thing, and a hell of a lot more abstract than "Nigger, nigger". Lee Atwater 1981

Now notice that Lee is watching what he thinks is a trend down in racism by coding (dog whistles), but it's always there just below the surface. Why? Well, doesn't LBJ tell us there's money in it? And isn't LBJ telling us what Trump has been doing? This isn't going away, we will always be a racist country of some sort.