He had to wait till there was a Northern victory, or it would look like a desperate measure.
To honor president Lincoln
Effective from January 1st 1863. Lincoln had issued it in September 1862, but wanted to give individual state governors time to decide whether to quit the Confederacy and re-join the USA. (None did.)
They didn't. They came close to supporting the Confederates, but were headed-off by Lincoln's Emancipation Proclamation - it would have made them look pro-slavery themselves.
Lincoln had it ready by July 1862, even as he made his speech about not wanting to attack slavery. But he could not issue it while the Confederates were winning so many battles - it would have looked like a desperate gesture. He had to wait for a Union win, which came earlier than expected, in September. He issued the Proclamation immediately afterwards - to be effective from January 1st 1863.
The proclamation allowed minority troops who were forced to join the army to decide for themselves not to join the army.
Lincoln argued that it was wrong to decide whether to allow slavery in a state or territory by voting
Lincoln argued that it was wrong to decide whether to allow slavery in a state or territory by voting
It decide who would be king, William, duke of Normandy, or Harold of England.
secede
Lincoln argued that it was wrong to decide whether to allow slavery in a state or territory by voting
The Battle of Saratoga,