All of the following were causes of the Civil War EXCEPT
A the firing on Fort Sumter.
B Abraham Lincoln's election.
Cthe secession of South Carolina.
D John Breckinridge's death.

D

Explanation:

The answer cant be a, b, or c since all of these events had a effect on the war unlike d.

I hope this helps!

the answer would be:

b. race

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