The correct answer is D) Crowded, unsanitary living conditions in tenements.
A problem many urban American faced during the early 1900s was Crowded, unsanitary living conditions in tenements.
Many Americans migrated to from poor rural areas in the United States to larger, urban cities. By 1790, 90% of Americans lived in rural areas. But urbanization increased in the early 1800s in the United States. By 1890, 30% of citizens lived in urban areas. One of the problems that many urban American faced during the early 1900s was Crowded, unsanitary living conditions in tenements. The Industrial Revolution of the late 1790s and early 1800s attracted many people to work in the factories located in the cities.