Question

Which factor contributed most tthe growth of the middle class?

Answer 1

Large numbers of middle-class immigrants came to the United States from Europe and Asia. ов. Industrialization and the rise of large corporations created a need for more salaried professional workers.

Answer 2

"The lure of new, high-paying, high-skill manufacturing jobs"

Step-by-step explanation:

Towards the end of the 1800s, the United States of American economy moved or transitioned away from agriculture to an industrial economy.

It's evident through many railroad construction and the western territory expansion which led to more jobs, business, and manufacturing of goods.