Question

cities, such as new york and chicago, experienced great growth during this period mostly due to... more innovators a rise in birth rates immigration rewatch submit

Explanation:

During the industrial growth era of U.S. cities like New York and Chicago, the primary driver of their large population and urban growth was massive immigration. Millions of people from Europe and other regions moved to these cities seeking factory jobs, far outpacing the impact of birth rates or innovators alone.

Answer:

Immigration