I'm not sure how plausible this is, but I was wondering if there were any way to have the Union win the war, or create a situation where victory is all but assured, between the time the emancipation proclamation goes into effect and the official start of Lincoln's second term, March 4th 1965. Again, this may be unworkable, but I'd be interested to see how this could be pulled off and what the potential consequences would be. I apologize if this is just utterly impossible given the tactics and logistics of the war.