At that point, you would need to something like the state to force people to mix.

> I don't think many blacks care of being a "small minority" on a posh white neighborhood...

I respectfully disagree. I'm Chinese-American, grew up in the US, but still see definite advantages to living where there are other Asians: better access to food that you grew up with, a doctor who might be more familiar with your genetics, not being the only person in the room who looks different, better access to Chinese school if you want to send your kids there, etc.

My college roommate was black and we went to school in a town that was >95% white (besides the student population). There wasn't a single stylist in town who knew how to cut black people's hair properly, so a few entrepreneurial black students would actually go around cutting their fellow students' hair on campus, like they would show up at your door and cut your hair in the dorm bathroom. They were in such high demand that sometimes it would take a week or two before you could get on their schedule.

It's these sort of minor annoyances that people do take into account when deciding where to live. Constantly feeling like your own needs and preferences are out of the norm can be a stressful experience, even if nobody is being overtly racist.

Would I necessarily mind living in 90%+ white Middle America? Probably not, but it would not be my first choice, and all that's necessary is for a slight preference to exist.

We do. Besides what a sibling has already mentioned regarding some small cultural difficulties, there's the whole "police killing us all the time" thing which is much less likely to happen if you're in an area where being black doesn't make you stand out

You're implying that they don't have the choice of an equally posh black neighborhood, in which case such a slight preference against being a minority wouldn't be surprising at all.

https://en.wikipedia.org/wiki/Redlining