Another poster and I had got on to the question of whether world federation would make the Question of Canada and Quebec being one or separate nations less important than it is now with Canada as a sovereign state. I put this in the international politics thread because the same principle could apply globally too.
My argument was that sinse we'd all share a common world citizenship ayway, whether Canada was one nation or two with Quebec would be less important than it is now sinse it would then be nothing more than an administrative division. To take a comparison on a smaller scale, whether the North West Territories and Nunavut are one territory or two is not as important as if the NWT were a sovereign state because they're still part of a larger Canadian federation and so don't restrict freedom to travel for citizens there either way.
Of course we could argue that the question is still relevent to some extent sinse two regions with different cultures might still want different laws within a decentralized world federation, just as in Caanda Nunavut can pass different laws from the NWT. I'm not questioning that part, but still believe that when the division is within a larger federation it becomes less significant than when it's within a sovereign state, which would create two sovereign states and thus break ties significantly, not to mention divide citizenships.