The election of Abraham Lincoln led Southern states to secede because: They hoped most northern states would secede with them.
They claimed that John Breckinridge had actually won the election
They believed Lincoln would not attempt to stop them.
They viewed Lincoln as a threat to slavery in their states.

as general terms,  indian territory,  the indian territories, or  indian country  describe an evolving land area set aside by the  united states government  for the relocation of  native americans  who held  aboriginal title  to their land. in general, the tribes ceded land they occupied in exchange for  land grants  in 1803. the concept of an indian territory was an outcome of the 18th- and 19th-century policy of  indian removal. after the  civil war(1861–1865), the policy of the government was one of  assimilation.

c. is the answer : ) (you may punch me if im wrong lol)