The treaty of versailles caused WWII.
A, Slaves provided much of the labor on plantations that grew cash crops would be the answer I would go with. Most slaves worked in crop fields, and iron working didn't become prominent in the US until the industrial revolution about 10 years after the Civil War. I cannot say I'm 100% certain, but the others to me don't seem to make sense when looking at the situation.
Well the Indians were forced into Silver mines that killed thousands of them and the Spanish were the ones forcing them into the mines
Answer:
A. DeCristofano was inspired by Einstein
Explanation:
Each was a natural trading partner.
Taking a side in that conflict would have had bad consequences for the U.S., the proverbial no-win situation.