What did abraham lincoln believe about slavery?

the union had to become either all free or all slave.

slavery was becoming less common, even in the south.

slavery could be confined to certain states.

slavery was economically inefficient.

He more than likely believed that A: The Union had to become either all free or all slave.

b.

explanation:

he is racist

"oh, lets coppy china and build a great wall around bla bla bla.that way,we wont lose out to other countries." in the end, he did not build anything

the answer is a) to be able to obey them.