Answer :
The US interstate highway system destroyed the city's white urban middle class and lower middle-class residential areas. New "whites only" residential areas were created in low-cost land areas outside urban and suburban employment centers and in formally rural agricultural areas by providing means of economic communication at low (relatively) cost. Those areas are being acquired by land speculators, who have profitably developed them into suburban residential housing subdivisions. With all interregional connectivity and newly built shopping and commercial centers.
Before the US interstate highway, even small- to medium-sized cities had dense urban cores, with much of the development geared toward pedestrians and mass transit users. After the interstate, by the 1970s, only a few areas had the density to support pedestrian and mass transit infrastructure until more and more people depended on cars. It's popular now to blame urban areas on freeways. It's just as important to consider that many suburban areas, especially in the Northeast, need new housing developments with 2-5 acre land requirements. Also, many areas across the country have strict zoning requirements that only mandate residential development for miles and miles of land, so no one would walk that far even if they wanted to.
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