By keeping the British and the French from sending aid to the Confederacy.
Both those countries had abolished slavery years before, and could not be seen to fight against the (newly declared) liberators of the slaves.
The Proclamation came during the tenure of Henry Halleck as General-in-Chief, and just at the time when George McLellan was being relieved as commander of the Army of the Potomac (for failing to pursue and destroy Lee's army after Antietam), to be replaced by Ambrose Burnside. In the West, at this time, Grant was preparing his long and difficult campaign along the Mississippi that would end with the surrender of Vicksburg.
Lincoln's issue of the Emancipation Proclamation, keeping Britain and France from aiding the Confederates. Success of the Union Naval blockade, preventing the South from exchanging their cotton for war-supplies. Grant's ending of the system of prisoner-exchange - after this, the Confederates were bound to run out of men first.
Norths Devils was created in 1927.
The Emancipation Proclamation did not free all the slaves in the United States, it only freed slaves that were not living under Union Control (Norths Control). The Emancipation Proclamation also states that black soldiers can fight for the union, at this point the Union were in need of soldiers. Our 16th President Abraham Lincoln issued this Proclamation
COTTON
Monitor
my butt
stength in numbers
because they were ugly
Rapid population growth
It was focused on technology and industry
To get renforcement.