I love the idea of the canucks invading DC
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However, I can see two more starting point for T2K+9.
First, the collapse of the EU with tensions quickly rising among its former members. However, I'm not sure to know how this could evolve.
Then, a fourth french revolution (1789, 1830, 1848, 2009) that brings some kind of extremist to the head of France (after all we invented communism). I'm not saying that France will have a revolution any time soon, but I would consider the risk to be real at the moment. I can imagine several ways for a new french revolution to become a reality and, with the french, you know where it starts but you never know where it ends. In 1789 the casualties finally reached several millions as the result of an almost world war (The Napoleonic wars involving all European nations, Egypt, Russia and the USA).