Ask the residents of areas which were predominantly white that are now predominantly black and brown. There's your answer. See Chicago, St. Louis, Detroit, Baltimore, Gary, IN., for reference.
It's all that inbreeding. Aryan nationalists are the 1st to avoid a DNA test, for fear of finding out what truly is there
I just saying my opinion is irrelevant. Leftist theory has it that once all the white people are gone the place will be a regular Shangri-la. Well, there are places you can go and test that theory. Go ask the people who now live in places which were overwhelming white that are now overwhelmingly Black and/or Hispanic. Ask them what they think of their community. How safe is it? What's the opportunity like? If given the choice would they stay or move? It's their experience you should listen to, not mine.