We were induced by advertizing to desire a house in the suburbs, driven by those who profited off of development and also the auto industry and the oil business.
The mass movement to the newly constructed burbs drove sucked out economic activity fromt he inner cities, which left them to decay, without the needed tax base or the politial power.
The Dems/commies pounced on the opportunity and made those who could not afford to move to the "desireable" burbs their own political power base.