What was one change taking place in america in the early 1800s that gave rise to an age of reform?
the nation's large population of immigrants was pushing for change.
slavery was decreasing, which gave rise to growing ranks of unemployed people.
the rapid growth of cities was bringing about overcrowding and crime.
the country was experiencing civil war.

The rapid growth of cities was bringing about overcrowding and crime.

Explanation:

The rapid growth of cities brought with it overcrowding and crime, this was because of the lack of education, lack of prisons and lack of equal rights, the age of reform came thanks to this necessities being evident for the public eye, and an exigence from the society to change certain things, like educations, the prison system, women´s voting rights, and start to create institutions to ensure civil rights and the proper development of a society.

d

explanation: