Answer:
the growth of suburbs
Explanation:
The postwar era which was around the 1945s to 1950s experienced the increased availability and affordability of cars most in the United States and it facilitated many social changes one of which was "the growth of suburbs."
This is evident in the fact that the postwar era leads to an economic boom in the United States, and there are high employment opportunities in the cities. This lead to city expansion and many workers had to move to nearby cities to live because it was cheaper
However, the availability and affordability of cars made the outward movement easier to occur.
