You're leaving how a key part, at least in America which is racism. Whites ran to the suburbs to escape particular groups and quite frankly still do albeit now it's more in the form of urban sprawl.
Plenty of other data shows the same thing. Racism is very much a part of what built suburban america in the large even if it doesn't apply to you or your family personally.
Today, it usually isn't about racism, it's mostly just continuing status-quo trends without question. But it's important to not put the initial motivation of those trends up on a pedestal.