In the second half of the 1800s, which development led to the other three? (1) expansion of political machines (2) growth of American cities (3) development of tenement housing (4) increase in crime

The correct answer is number 3) the growth of American cities.

In the second half of the 1800s, the growth of American cities led to the development of tenement housing, which led to an increase in crime, which led to the expansion of political machines.

With the growth of larger cities in the United States like New York or Chicago, those places became overpopulated. When immigrants arrived in the United States, they wanted to live in those larger cities because there they found more job opportunities. With thousands of new people in these cities, it led to the development of tenant housing that was 4 or 5 stories buildings built in the 1840s and 1850s as a new form for urban working class people. WIth these so much people living there, crime increased and became an important issue for the government to combat. Finally, the political machines like Tammy Hall, the political Machine of William M. Tweed that wanted to control political decisions with corruptive practices.