For those who say that the US will not invade Canada:
I am certainly too far away to have an experience based opinion here, so let's just do that "learn from history" stuff, okay?
Can you name me armies that, if ordered by their ruler to have an easy victory, turned around and said "No!"?
I would say the bare minimum requirement to that is that a definite majority of the army is against their ruler.
So far half of the Americans still like Trump, like what he is doing, and the army is traditionally more traditional, means the amount of MAGAs or not-MAGA but nationalist in there will be higher than in the average population.