I'm not going to dispute that, but America has a lot of company.
Remember how WWI started with the assassination of a minor guy nobody had heard of, but it dominoed into a conflagration that killed millions? Now imagine that domino effect starting with one small psychopathic nation getting froggy with their nuke (because what's the fun of having if it, if you aren't going to play with it?), and it's on.
Like 700 typing monkeys, one day some scenario will all line up, and there's as good a chance of this scenario as any.