Which group of people supplied most of the labor in the new factories in major cities? A. newly freed southern slaves
B. former Union Army soldiers
C. immigrants from Latin America
D. immigrants from Europe

your answer is D

Many of these new immigrants were trying to escape religous persecution and famine (like the irish). There was also and land and work shortage in Europe, but the United States could provide free land and men were needed for these factory jobs.

e. all of em

~courtney