For context: https://en.wikipedia.org/wiki/White_flight
Basically, what it says on the tin; were white families moving in the 1950s specifically to get away from non-white people? Or was that just the end-result of a swirl of circumstances involving property, economic incentives, etc.
This isn't a complete answer, but many of the suburban post war developments were created with either deed restrictions (no Blacks or Jews) or effectively refused to sell homes to Black families. Part of the motivation was the trend towards re-segregation of American life due to FDR's "redlining" mortgage under-writing scheme which penalized white households for living in racially mixed neighborhoods.
https://www.nytimes.com/1997/12/28/nyregion/at-50-levittown-contends-with-its-legacy-of-bias.html
The salesman was not honest with Mr. Burnett. Blacks and other minorities had no chance of getting in, because Levitt had decided from the start to admit only whites.
The government's efforts were "primarily designed to provide housing to white, middle-class, lower-middle-class families," he says. African-Americans and other people of color were left out of the new suburban communities — and pushed instead into urban housing projects.
In addition to what was going on with housing, African Americans were less likely to own cars due to differences in income compounded by limits to access to affordable credit.
Car ownership: https://nationalequityatlas.org/indicators/Car_access
The Color of Money: Black Banks and the Racial Wealth Gap by Mehrsa Baradaran
Congress attempted to address some of these equalities in the late 1970s, but progress has been slow.