How do you imagine that will work? The US may have to lower the price more than they can afford to. Some countries have already cancelled their F-35 orders. You can't force someone to buy what they don't want.
In hindsight, the project was (as expected) over budget etc. I wish our government(s) had given that money to European fighter jets instead. There's a chance the US will remote disable the jets that have been put into service now, or withold service / spare parts.
The opium wars would disagree
Canada is absolutely indefensible with no strategic depth or ability to get new supplies. Mexico is harder to occupy but their military is a joke and again easy to block all external supplies. Very doable.
Talk of the Chinese being invited in by Canada or Mexico is precisely as much of a casus belli as Ukraine saying "please let us join NATO so Russia won't invade us!". Canada already has reason to fear invasion regardless, as Trump keeps talking about annexing them.
It didn't work out well for Russia, which is currently experiencing in Ukraine much what the US itself experienced in Vietnam. Or indeed in Cuba (Bay of Pigs) the year before the nuclear missiles which were much closer to a real casus belli.
Which is why military alliance discussions aren’t conducted in public. The series of announcements would be e.g. Xi visiting Ottawa for trade talks and then announcing that Canada is under its nuclear umbrella.
> Canada is absolutely indefensible with no strategic depth or ability to get new supplies. Mexico is harder to occupy but their military is a joke and again easy to block all external supplies
Which is why they’ve sought external security guarantees. Now that America is threatening invasion, its security guarantees are diluted. So you need someone else; the only option is China (unless the EU beefs up).
Problem is, China might be happy to see the US invade Canada, because then they can finally take Taiwan. And that's the real danger of Trump's foolish aggression: by weakening American's alliances, he's giving China more space to assert itself and take what they want.