What factors contributed to the end of child labor in the United States?

Child labor has existed for much of U.S. history, though most has Immigration to the United States led to a new source of labor and Changing attitudes toward work and social reform weren't the only factors reducing child labor; of education means many are working longer hours to make ends meet.

Explanation:

you have to study

they gained popular support by speaking out against communists

in the united states. ( d.)