As always it’s a pr thing and the win could be with very little bloodshed.

American and Canada have had disagreements before and we always will. Not as serious but we’ve always had them. The thing is everyone I know, and the news media at the time, holds Canada in such high regard that we’re on your side. If they did try to invade you’d probably get a hoard of rednecks flooding north but they’d have to come through the northern states and would be held up at every crossroads. They’d drown in a mess of protests before approaching the border