Which development contributed to rapid urban growth in the 19th century United States?

• A. Immigration from Europe and elsewhere.
• B. Decreased birth rates.
• C. Isolationist trade policies.
• D. Decline of industry.

Answer: (A)

Immigration from Europe and other regions provided a large and steady flow of people into American cities, fueling factory labor, housing demand, and urban services as the United States industrialized in the 1800s. This massive influx transformed many rural areas into crowded urban centers and helped cities like New York and Chicago grow rapidly. Birth rates were rising rather than falling, so that alone wouldn’t explain the sudden surge in city populations. Isolationist trade policies would have slowed economic growth and urban development, and a decline in industry would reduce, not drive, urban growth.