In the Civil War, one major reason the North fought the South was
A. to put in jail all slaves who had escaped,
B.
to make it legal to keep slaves.
c. to send all slaves back to Africa.
D.
to bring an end to slavery.

D. to bring an end to slavery.

Explanation:

It can't be option A, since they were the ones who freed the slaves to fight for them.

It can't be option B, because they were against slavery, and it can't be option C either, because they didn't need to send the slaves back to Africa to solve the problem.

answer; /// i do believe that its napolean's conquest of spain;

the answer is expolration. hope this !