I've been toying with modding the game lately myself, and have found out most of what I know from either just toying with the files myself, or reading over the wiki: http://hoi2.nsen.ch/wiki/index.php/Main_Page
Evans said:Noone seems to realise victors in wars of that time took territory off their defeated foes do they? Well, at least not where the ACW is concerned. I don't think most of Alsace-Lorraine was too keen on being integrated into Germany either...
Had the Confederates won they almost certainly would have re-united Virginia and perhaps taken over other areas.