The number one cause of the American Civil War is the issue of slavery.
Answer:
Ewan ko rin. Di ka kasi nakikinig sa teacher mo eh
Explanation:
Gusto mo sagot?
Luh asa ka^-^
They weren't too eager to get involved in a war which they didn't know the outcome, and they didn't want to become involved because of the impact it may have on their trade with the other countries.