I believe the answer is D.
hope this helps :)
According to Wikipedia South Carolina became the first state to declare its secession from the Union on December 20, 1860, with the Declaration of the Immediate Causes Which Induce and Justify the Secession of South Carolina from the Federal Union and later joined with the other southern states in the Confederacy.
A is the correct answer.
Reliance on raw materials and the markets of other countries forced the United States to become much more interested in ensuring stability in those countries so that American producers could have reliable sourcing at even prices.
The answer is C. Rugged mountains.
Hope that helped, fam!
Your fren,
Une
P.s. May the brainliest man/woman win, eh? *wink wink, nudge nudge* ;)