There are three main causes behind the fast expansion of suburbia in the 1950s:
Residential regions and business districts are separated by the suburbs, a low-density area. As a city grows, so does its suburbs. A variety of causes contributed to the fast expansion of American suburbia in the 1950s. One of them was a rise in the number of people who commuted between their homes and the city by car.
Also, low-interest house loans were available in the suburbs for those in the middle/low-income bracket. We may thus deduce that the terms used to characterize causes for suburban sprawl are those mentioned above.
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