One should note that slavery in the District of Columbia was ended in 1862.
The rebellion was begun by the southern planter aristocracy, for the continuance of slavery. The rebellion was put down by the legitimate government of the United States, for the continuance of the Union.
Ending slavery was the right thing to do, during the war, in territory controlled by the rebels, to weaken the south. Black Americans fought for the legitimate US government. Ending slavery became the good thing that came out of the war, unless you also count the deaths of many foolish supporters of the aristocracy as a good thing. The United States ended slavery by means of the 13th amendment.
you should note that the proclamation was INTENTIONALLY written at protect NORTHEN slaveowners, whether their slaves were physically located in the north or in the occupied south.
no matter how much you wish TWBTS was about ending slavery, it was ONLY about LIBERTY for dixie.
arguing the opposite makes you look STUPID and/or IGNORANT of the period. in 1861 you couldn't have found 10,000 people who cared a damn about the plight of the slaves (NOBODY of course asked the slaves!).
when the war began going badly for the damnyankees in late '61 & Great Britain, Canada, Mexico & France were about to enter the war on the southron side, SUDDENLY the damnyankees declared the war to be a "crusade to end slavery". it was a self-serving,outright lie then AND now.
free dixie,sw