There's some merging and splitting that goes on, just didn't think it'd be all that important. IIRC, by 1860 there are 8-9 countries instead of 13-14 (Vermont :\)
I did not realize that the North didn't ban slavery until that late, I figured it had always been that way. I'd been focusing on the South, so missed it
Virginia is an interesting question. Yes, it will include Kentucky, and it will be heavily entrenched with both Pennsylvania and New York diplomatically, so they'll definitely be putting the pressure on. My main concern is what happens to the former slaves after such an emancipation.
As for the deeper South, there's two issues I'm having. First, how much call in the North would there be for something to be done about it. No matter how strong abolishionists get, invading another soverign state is a good deal more serious then doing something about slavery within your own borders. Secondly, because of all the changes, settlement and immigration will be different, of course. Georgia (including more land, of course), in particular, is going to have quite a few more people then OTL. I assume with a larger, non-wealthy white population there's going to be some effects there as well.