alt Hacker NewsThe current (or next) admin would take Alberta and Saskatchewan. They'll propose that the residents secede from Canada and join the US.
There's probably enough political willpower in these provinces and money (paid by the US) to turn this into a real movement.
And from there, Yukon and the Northwest Territories are easy next dominoes.
There's a vocal minority of perpetual malcontents in Alberta arguing for secession. But even those nutters don't want to join the US.