He made an issue of just about anything that would help him win it. For the first year or so he was hesitant about adopting emancipation as a war measure, since this might alienate the Border Slave Stattes, and foreclose any hope of the South returning voluntarily to the Union. By summer 1862, the Border States were powerless to secede, and all hope of peaceful reunion long gone, so Lincoln went ahead with emancipation.
Slavery
He worked with Abraham Lincoln on the issue of freeing slaves during the Civil War.
He worked with Abraham Lincoln on the issue of freeing slaves during the Civil War.
Frederick Douglass, the noted African American abolitionist from Maryland both encouraged President Lincoln to issue the Emancipation Proclamation and spent most of the Civil War raising "Colored" volunteer regiments to fight for the Union.
Antietam (Sharpsburg). It was the unexpected Northern Victory that gave Lincoln the credibility to make the proclamation without making it sound like a desperate war-measure.
The end
At the end of the civil war. (1865)
Copperheads.Congressional republicans who opposed Lincoln's handling of the war and the slavery issue were called radicals. Those that were willing to have peace at any price were called copperheads.
Partly because the war was not directly about Abolition. And partly because he needed to stay friendly with the four slave-states that had not joined the Confederacy.
I'm pretty sure it was the civil war.
Fredrick Douglass
Fredrick Douglass