It has been stated several times at totalwar.com's forum that there will be 2 campaings. One just on the americans and another for the rest of the game. And as far as I know for EVERY single faction you can basically get 2 different factions. If you get a revolt playing as lets say spain then you could choose between either side. So USA is not the only emergent faction if the grand campaign. You can not start off as the united colonies at the beginning of the game because they don't exist. You have to have certain requirements/events to happen first.
Anyways maybe I could have a Canadian emergant faction :p.
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