Answer:
A. new market are opened up on both coast.
I'm not sure
He belives that no group would be strong enough to oppress others.
Mostly the reasons were economic. The country's economy was dismembered when it entered the great depression and they had to take care of that. The South used this to reinforce its values because nobody was bothering them since the great depression forced the government to move its focus on something else.
C) The Responsibility To Protect
Hope this helps :)