Between 1950 and 1970, suburbanization: a. encouraged Puerto Rican immigration. b. eased racial tensions in American cities. c. hardened racial divisions in American life. d. encouraged a revitalization of American cities. e. was the theme of the Broadway musical West Side Story.

c. hardened racial divisions in American life.

Explanation:

Between the year 1950 and 1970, the way of segregate American life was the suburbs, because, the suburbs became dominant in the cities, and,

hence, it is also known as white fight, there was the practice of prejudice by the suburbs in the planners and banks.

Hence, the correct answer for the given information is c. hardened racial divisions in American life.