Question

what was not a problem in most u.s. cities in the nineteenth century?
○ disease
○ crime
○ fire
○ unemployment

Explanation:

In 19th - century U.S. cities, rapid urbanization led to overcrowding, poor sanitation (causing disease), lack of proper fire - fighting infrastructure (making fire a problem), and high crime due to social unrest. However, the industrial growth and expansion of cities created many job opportunities, so unemployment was not a widespread problem compared to the other three.

Answer:

D. unemployment