Pete Saunders -- the author of this article -- has run a blog called
The Corner Side Yard for many years, and it's very much worth a read, whether or not you agree with his viewpoints.
Something that I have yet to see pointed out is that there were historically not one but
two types of segregation in the US: Jim Crow-style segregation might be more (in)famous, but spatial segregation -- usually realized in the form of ethnic neighborhoods -- was quite common throughout Northern conurbations.
White flight worsened spatial segregation. There is a reason Southern cities tend to be more spatially integrated today: the civil rights movement succeeded in undoing de jure Jim Crow-style segregation, which had a more pronounced impact on the south, where physical proximity was a relatively unimportant part of the segregation regime, but modern urban planning, and especially the zoning paradigm upheld in
Euclid v. Ambler,
worsened spatial segregation.
In many of the more extreme cases, like St. Louis, Chicago, or Philadelphia, whole quarters of the city became demesnes of specific ethnicities -- black, white, Latino -- while the paradigm segued into more class-based segregation in the suburbs. This process, little-remarked-upon, has continued unabated.
Meanwhile, as black families have achieved the middle class, they've moved out of the city, following in their cousins' footsteps from a half century prior.
Though this raises the question of why there's a "reverse Great Migration" ... why Chicago's black population is leaving the region entirely? Migration on that scale has to be driven by push and pull factors -- lack of opportunity in Chicago (push); opportunity elsewhere (pull).