Fortunately.....Americans. Religious fanatics (like this woman.
http://www.youtube.com/watch?v=Mfgb4DLKH5g), domestic terrorists, and domestic militias (like the minutemen). They were given the nukes by an American senator who used the chaos after the nuclear attack, to become the President of the Allied States of America, a country between the Mississippi and the Pacific, minus Texas. The Republic of Texas, I am sure that is what it is called now, is fighting for independence, while the remnants of the United States is fighting the ASA from the eastern states between the Mississippi and the Atlantic. Alaska is now either, independent, part of Russia, or part of Canada. Hawaii is either part of the ASA, or is independent. A friend of mine thinks that the military presence on Hawaii may instead made it a military dictatorship.