The main reason the US Civil War started because the Northern and Southern colonies had different views on how slavery should be handled. So they went to war to decide.
Yes, you have to be a U.S. citizen over the age of 18 to be able to vote
The Mexican Cession happened in 1848. In this treaty, Mexico handed over Texas to the US. Hope this helps.
Im pretty sure the answer is A. ((APEX))
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