Even if Canada would merge with the US, surely it wouldn’t become a state. We all know the importance of the Senate at this point, and how the two-senators-per-state rule affects things. At the very least, each province would want to become a state to get more senators, and it may be in the best interest of some of the larger provinces like Ontario or Quebec to subdivide to gain even more, if they can get away with it. Goodness knows the idea of splitting California has been floated by some to try to get something closer to senator-per-capita parity.
Y'know, I can see a future where Canada gets annexed, but not Quebec. Those francophones will burn down the whole province down and salt the earth before they became US citizens. I just know it. And I wouldn't blame them one little tiny bit.
Maybe Alberta would accept being annexed fairly quickly but the rest of the Canada would fight just as hard as the Québécois. Part of the Canadian identity is not being American and like hell you're taking that away from us.
I'm not suggesting the rest of Canada would lay down and take it, just that the image in my head of Quebecoise is one of salt of the earth and die on that hill type. Like, Canadians are Not American™, and Quebecoise are Not Any Of You Fuckers™