Final answer:
Immigrants settling mainly in cities contributed to the urbanization of the United States in the late 1800s and early 1900s.
Step-by-step explanation:
One factor that contributed to the urbanization of the United States in the late 1800s and early 1900s was the influx of immigrants who primarily settled in the cities. These immigrants were drawn to urban areas for various reasons such as job opportunities, access to transportation, and the availability of social services. Their presence in cities led to increased population and the growth of urban areas.
Learn more about urbanization in the United States