Lincoln Announces the Emancipation Proclamation
Five days after the Battle of Antietam, Lincoln announced that enslaved people in Confederate states would be declared free on January 1, 1863. He had been waiting for a Union military victory to give the proclamation credibility.
The announcement transformed the Civil War's purpose, making the abolition of slavery an explicit war aim and discouraging Britain and France from recognizing the Confederacy.
Outcome
Emancipation Proclamation to take effect January 1, 1863