Rivers provides transportation routes is the most common eco system
The question is kinda lacking. Probably, it has choices to make the question answerable.
I'm pretty sure the answer is D. poor working conditions, because people back then were very serious when it came to working, since they needed the money badly. All of the other answer choices are factors that led to the Great Depression.
If other countries aren't willing to fight for them and they cant fight for themselves the United States probally would but no we dont have to
