That's correct, suburbs are the product of the worst housing experiment in the US, in which racists fled from cities to suburbs. They were designed to benefit white people in the aftermath of WW2, because white people were more likely to afford a car. More racism prevented POC from buying in the suburbs or qualifying for housing loans. A second layer of racism came when the Department of Transportation intentionally used Emminent Domain to design the highway network for disrupting and dividing neighborhoods of black people. The whipped topping of this racism pancake came from an unassuming supreme court case, which allowed for municipalities to "preserve the character of the community", which cemented racist single family zoning into city ordinances and prevents literally anything other than a single family home from being built