So, I'll give you my scenario - Al-Qaeda successfully carries out a major operation against the U.S. They explode a nuclear bomb, secretly supplied by Iran, over New York City, resulting in millions of deaths. The nation is in a state of shock - and then a plethora of smaller bombings occur, where a few couple more million die. The President is assassinated, the Pentagon destroyed. Palin's now President (just for lols and chuckles). Al-Qaeda announces that it will cease action against any state not directly controlled by Washington. Alaska declares independence (Ouch to the President), as does Texas. Additionally, coastal states start publicly declaring that independence is an option. The president decides to hold the U.S. together and sends troops to all states where independence seems to be an option, or has happened - ~7 in total. The President is assassinated, and with outside pressure the federal government collapses. Russia invades Alaska and starts expanding eastwards and southwards. Mexico openly supports Texas and other states with a large Latin-American population, and quietly starts to infiltrate politically and militarily. China establishes a small military presence on the West Coast. Canada, while fighting with Russia, starts expanding southwards on the East Coast. NATO starts an aggressive campaign in the Middle East while creating a strong military presence in Eastern states. India and Brazil stay neutral. Cuba runs in to get a slice of the Mexico-supported pie.
I know it's not realistic (since Palin won't be a vice president.. ever, probably) and for many other reasons, but this is an example. What do you guys think will happen? Then give your own scenario.
None.