During the civil war, african american military units were usually a)led by white officers. b) chose their own officers to lead them. c)formed in both the north and the south. c) included white confederate soldiers.

I think it is C

Explanation:

Both North and South had black soldiers. The south had them becasue they had limited forces. The South promised Blacks freedom if they fought for them.

the tariff was created to protect industry in the northern part of the united states. industries in the north were being driven out of business by imported goods that were priced at a low rate. the goal was to protect these industries   by taxing the goods.