> Support for suburbanization was not coming just (or even primarily) from FEMA, all kinds of federal agencies had a hand.

There were also non-government actors pushing this - banks redlining the suburbs in order to achieve soft segregation in areas without formal Jim Crow laws on the books, for example.

The legacy of this is the most segregated city in the US, Milwaukee, is in the north, and a major cause was redlining.