The answer is A. French, hope I helped, let me know if it's right.
This is false. Workers in American mines, mills and factories were poorly paid, and their jobs were extremely unsafe. These horrible conditions (among other things) eventually led to the formation of unions.
It grew exponentially in this period because in the aftermath of the second world war, there was a baby boom as a result of numerous young couples created by high amounts of returning soldiers.
Answer:
Introduction of Western Hemisphere crops
Explanation: hope this helps