I figure that some time in the future, we're just going to be a huge country. One big fuckin' blob of land and people. Canadians and us folks from the States aren't that different - all things considered, the only difference is really our government. Because of that, we each have nationalism... but even the dead & beaten horse of "eh?" is just dialect, much like southerners say "gawlee!" and the like. I'm figuring probably in 200 years. The border will dissolve and we'll become one nation. I'm not saying the United States will become a part of Canada or that Canada will become the 51st state - rather, we'll just kinda merge. I dunno. It just seems like it will happen one day. I could be wrong though.
Plus, if we did that, we'd have Russia beat, size-wise