We'll just have to agree to disagree. We mainly agree, but I just don't see any plausible path to a military invasion of Canada. Although you'd be powerless to stop it, technically it would trigger NATO Article 5. So the U.S. would be at war with the rest of NATO? LOL.
And we also know that Canadians now hate Trump so much that there is no plausible scenario where his bullying tactics would ever result in Canada willingly joining the U.S.A.
Like I said previously, we don't want to rule out utter depravity and dumbfuckery of POTUS. But first, he'd have to order a military strike on Canada, or the Panama Canal. What happens next is currently unknowable, but being that such a preemptive strike is legally dubious at best, it's not quite as simple as he has the full power to do whatever he wants, whenever he wants. Trump doesn't have the unchecked power of Kim Jong Un or his daddy Vladdy.