Final answer:
By 1920, the movement of Americans towards urban areas resulted in more living in cities than rural spaces, highlighting the transformation of the United States into an urban nation.
Step-by-step explanation:
By 1920, more Americans lived in urban areas than any other place in America. This shift from a predominantly rural society to an urban one was characterized by significant growth in the population living in the cities. In the early 1900s, America had transformed into an urban nation with many citizens moving to urban centers like Detroit, New York, and Chicago.
This migration was spurred by industrial growth, opportunities for employment, and the attraction of city life. The nation's urbanization was a result of several factors, including advances in agricultural machinery that reduced manual labor on farms and increased job opportunities in burgeoning factory industries within cities.