Also, rewinding only a couple of decades from civil rights legislation; denying blacks the vote, school entrance and outright lynchings in the hundreds qualifies as pretty strong racial animus. It's naive to argue that the same society & people "had no racial animus in mind" when choosing where and how to live.
I've always thought of gentrification as more of an economic class issue (which so often corresponds to minority status). In Boston, a lot of poor and middle class white neighborhoods get gentrified as well - nonetheless I take your wider point that gentrification is often a positive force for urban renewal; and I agree. One counter-example: Hudson Yards is the 1% being gentrified with the 0.1%, hard to argue helps the urban fabric with its non-human scale.
I’m not trying to dismiss racism as a causative factor. I guess I’m just saying it’s like living in a sawmill, and racism is the sawdust. The sawdust causes lots of problems by itself, but it also gets all over everything else. Suburbanization was something mid-century Americans of all races desired; it just happened in a racist way.
I don't know how to solve this.
You can imagine if someone doesn't want black people in their neighborhood how they might feel about their children marrying one.
I don't know how to read people's minds, so I tend to gravitate towards a functional definition of racism which measures it based on someone's action - i.e. if someone being treated in an unfair manner based on their skin color.
To the typical mid-century white homeowner, "a black family moved into the neighborhood" wasn't the beginning and end of it. There were only two equilibria: either you live in a segregated white neighborhood or you live in a predominantly black neighborhood. (I openly admit there's nothing wrong with living in a predominantly black neighborhood, but this was probably not the most common opinion among mid-century white homeowners.)
Why? Fundamentally because there was a structural shortage of good housing for black people. If most neighborhoods don't allow black residents, having a neighborhood that does allow them causes a surge of demand. Even if you're not racist enough to move out just because a single black family moved into your neighborhood, some of your neighbors are, and many of their homes will be bought by black families, which will trigger your slightly-less racist neighbors to move out, and so forth. This was deliberately encouraged by "blockbusters", who would buy homes from white families at a discount and then price-gouge the black families who ended up moving in for a massive profit. But blockbusting only works if you have the pre-existing shortage of unsegregated housing in the first place.
You end up in a feedback loop:
(a) Moderately racist white homeowners want to keep their neighborhoods segregated because otherwise they'll live in black neighborhoods. This causes:
(b) Most neighborhoods are segregated white neighborhoods, causing a housing shortage for black families. This causes:
(c) Overwhelming surges in black demand to move into any individual neighborhood that desegregates. This causes (a).
The "solution" was to immediately, globally, across-the-board, outlaw housing discrimination so the pent up housing demand can disperse. I put "solution" in quotes because most American metro areas are still extremely segregated. They might be statistically segregated by 90/10 ratios instead of the 100/0 ratios that existed before, but people have to go significantly out of their way to completely reverse it, unless there's some other economic incentive. For example, gentrification has "desegregated" lots of majority-nonwhite urban neighborhoods through the sheer force of white hipsters wanting to move into them.
In fact, most racism gets expressed as racial separatism. Segregation was literally racial separatism.
One problem is that this literally turns into a question of ethnic territorialism, and can easily be extended from neighborhoods to entire states (Oregon was founded as a whites-only state) to entire countries (eg the notion of sending freed slaves back to Africa, which is how Liberia was founded).
It’s also just not that hard to express even the worst racism in mere separatist terms. In fact, that’s where most racism starts.
> also talks about the impact of educated, successful families moving out of historically black neighborhoods
Yeah, from what else I've read, that is one of the saddest parts of the story. Economic diversity is a hugely important part of a healthy community, and it's pretty uncommon in America.
Though I guess there is likely more than one cause.
https://www.oftwominds.com/blogjuly10/Cold.War.Urban.Vulnera...
The vast majority of proposals are from before 1956 -- i.e. before the Soviets demonstrated their own high-yield thermonuclear weapons. The degree of decentralization required to mitigate against the multi-megaton bombs of the later 1950s would have been truly staggering.
It’s also not clear how one is supposed to reverse the effects of white flight; when middle-class whites move into a majority-nonwhite urban area, this is usually condemned as “gentrification”.