Going against Canada would mean .. what? Having tanks roll in Toronto downtown? Assuming it would be a military success, which isn't guaranteed after what happens in Iran,that would be unpopular beyond anything we've seen.
Tough words, that's the worse we may expect from the US gov realistically.
Trade wars and sanctions can get very nasty too. I don't know about Canada, but most of the EU runs on US Big Tech to name just one sensitive sector.
Which doesn't mean it's easy or won't hurt like hell, but this is a continent that just cut most of the gas cord lines in record times despite massive pain and cost, if it came down to it we would simply because if it comes down to this and we don't then we're done.
Short time it would damage us pretty hard, but long term it would be another net loss for the US.
They whole point of that article is that it's a weird, curious thing from the past that doesn't exist any more.
That's true, right now. The way things are going though the EU is spurred to finally cut the cord with US Big Tech because of the security risk.
It didn't used to be like that before Trump got into power. Trump is bad for business because he's an unreliable partner that's turning on his allies.
There is an alternate timeline where Canada signed that, and it looks much bleaker for them down the road.