Can't really say. Could be other nuclear powers. UK, France, Russia, Germany, Somalia!
Maybe it was http://www.cracked.com/article_17165_6-reasons-north-korea-funniest-evil-dictatorship-ever.html. Lol.
Fallout's unwaivering patriotism has me believing that those damn commies did it first! :stare:
Unwavering patriotism? Fallout games constantly parody patriotism. Hell, in fallout 2 & 3 the primary antagonists are the remnants of the US government. Not only that, but according to the fallout storyline, the US government took advantage of the coming apocalypse in order to experiment on it's own citizens! Fallout games are hardly flattering of the US in any respect.
It was Canada. Yeah, definitely Canada. :nuke: :foodndrink: :nuke:
Canada didn't really exist at that point as we were annexed by the USA. (Btw, that could never happen in reality. You yanks couldn't even win Vietnam, and they didn't even have tanks or an air force. You really think you could take on Canada? Ha!)
I blame the US myself. At present 20-30% of the population and growing wants to see the world come to an end. That number would likely be much higher in the future.