I think we should be aggressively seeking to add Alberta, Manitoba, and Sonora.
Baja California-maybe.
B.C.-possibly. I love Vancouver Island, but there are a lot of commies there.
We should be encouraging Quebec independence. Ontario can suck eggs AFAIC, and the Maritimes can join if they give up welfare, otherwise, let 'em eat cod.
We had this conversation before. Keep your durn hands off Vancouver. I got dibs.
Alas for the maritimes, their economies were exclusively dependent on the seal and cod fisheries, both of which are long moribund. Alaska and Hawaii were only admitted simultaneously to the union because one was reliably Republican and the other reliably democrat. This is why the District of Columbia and Puerto Rico will achieve statehood when pigs learn to fly. I cannot imagine the sort of "Missouri Compromise" that would be necessary to take on any part of Canada but it sure seems unlikely that both parties could somehow divide it up equally. I do not see as we could afford to take on territories as our one and only colonial venture one hundred and five years ago (Philippines, Cuba and PR--Spanish American War "booty") is still costing us (Thomas Sowell went into some detail in one of his books how europe's vast colonial empires amounted to a lot of red ink when the pros and cons were added up). Canada will have to solve it's own problems. We can't afford it.
I'm all for the real working Canadians (BC, Albera, Manitoba, Saskatchewan maybe, to join the US. As to the Mexican provinces, I'd take Baja, but nothing else, and I'd fortify the border: I grew up in California and have seen it destroyed by illegal immigration. No thanks to a population of Mexican Indian peasants. Sorry.