Order by comander and cheif in US military. Because slavery was the confederacys labor force, depriving them of that would help the north win the war. Lincoln found a loophole, after the Battle of Antietam, Lincoln threatened the confedaracy to end slavery but if they gave up, they could keep slavery for a few more generations. No states took the offer so lincoln issued the order. The war was now about ending slavery. If south looses it is all over. european nations will side with union. Idea of 13th amendment came into play.

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