At the beginning of the Revolutionary War, the Continental Congress passed a law offering admission to the Union to any Canadian Province that chose to join. The purpose, of course, was to pry them away from British hands, and keep them from being an untouched base of operations against the Americans. THAT LAW IS STILL ON THE BOOKS.
Therefore, all that is necessary for any Province to become a state is for them to request that with a proposed constitution for their new State, and for Congress to give its approval to that constitution. Well, there IS the little problem of what the other Provinces and the Government of Canada might have to say about that. LOL.
And, as the second poster pointed out, there are certain Canadian Privinces that the United States wouldn't want on a bet. But that question is down the road.
Congressman Billybob
I'll take British Columbia and Alberta, eh?
there are certain Canadian Privinces that the United States wouldn't want on a bet
Quebec and the maritimes come to mind, eh?