In the Emancipation Proclamation, why wasn’t slavery ended in the north?

The inventor cocreated the film fred arts sneeze which was one of the first american movies

Which would be good historical evidence when studying manifest destiny?

How did african americans the union during the civil war? a. by serving as representatives in congress b. by enlisting in the military to fight c. by organizing massive slave revolts in the south d. by negotiating for peace with the confederacy