I guess more likely they’ll become like puerto rico or guam or something.

This is what you need to keep foremost in your mind. There is no conceivable reality in which the US conquers (yes conquers, they can call it annexation all they want but at the end of the day Trump wants a conquest to his name) Canada and gives any semblance of voting or personal rights to Canadians. Hell, even if Canada was somehow persuaded into voluntarily joining the US, this regime would never, ever honour any kind of arrangement that gave Canadians a fair deal. They are fascist bullies, as close to actual evil as we’ve seen in North America in a very long time, and they have no interest in any sort of fair bargain.