What do you think would have happened if Abraham Lincoln had waited until after the civil war to issue the emancipation proclamation?

Answer 1

The main purpose of issuing the Emancipation Proclamation was international Propaganda, as it had no actual effect in either the north or the south as written. It freed no slaves in northern slave states still loyal to the Union and although it declared the slaves to be free in those states then in rebellion against the Union there was no means available to enforce it. Thus all slaves prior to the Emancipation Proclamation still remained in slavery after it.

Only after the Civil War was over did Union soldiers have the ability to enforce the Emancipation Proclamation in the south. The slaves in the northern states that did not rebel still remained slaves until the Thirteenth Amendment completely abolished slavery (as the Emancipation Proclamation explicitly left them slaves to prevent having those states rebel too during the Civil War).