On this day: Lincoln issues preliminary Emancipation Proclamation
OTD in 1862, five days after US victory at Antietam, President Lincoln issued Preliminary Emancipation Proclamation giving Confederate states until 1/1/1863 to end rebellion or face permanent emancipation of enslaved people. Applied to states in open rebellion (so NOT border states). Image: NARA.
I actually never knew that there was an "out" for the Confederacy to avoid ending slavery. Likely they'd never take it, and that was prob Lincoln's perception so as to build public support for the proc, and it was a war measure first and foremost, but it's nonetheless an interesting detail.
Worth noting that when I was a kid I read a TON of Civil War books, and I'm pretty damn sure that not ONE of them made this sort of obviously important connection between the militaray & the political.