I did this a long time ago, but i dont play much, and i'll like to share it befrore i forget.
-Note: This scenario dont reflect any political position, its a complete fiction made for fun.
Story: War in Iraq (2003), in Iran (2008) and in Syria (2009) completly turned world opinion agaist America, and most of the oil producting nations of the world decided of an embargo on USA. Misery and pooverty turned many states agaist the federal governement, and the USA are collasping. Take command of a north american nation to rebuild the USA, or to conquer them.
Nations:
New England
Confederates
Midwest
Texas
California
Mexico
Canada
Quebec <--Added to avoid a 'super Canada'