Sorry for the long delay.
Essentially, the story of the world is as follows:
After the Twin Towers were destroyed, paranoid New Yorkers build a dome over Manhattan to protect themselves. Unfortunately, shortly after it was built terrorists struck, poisoning the air filters, which left hundreds dead. The United States launched a massive invasion of Iran (who supported the terrorists), but before they were successful Iran launched a number of nuclear warheads that destroyed several cities, including Washington DC.
A nuclear winter ensued that leaves thousands starving and changes weather patterns around the world. A new order arises in the United States that is extremely conservative and very wealthy. Those who dont fit or are too poor become increasingly disposessed. Women and minorities lose many of their rights; morality falls by the wayside as necessity takes the helm. A rebellion stirs. The rebels call themselves Jeffersonians, after Thomas Jefferson, and believe they follow his ideals (they dont, but that's neither here nor there).
The two factions wage war against each other -- the government trying to starve the rebels, the rebels trying to terrorize the government. Meanwhile the poor are caught in the middle, victims of murder, destruction, rape and worse.
That's the basics, anyway.