He did not like the Canadian prime minister's speech about "great powers" weaponizing economic integration, so he decided to prove him right.

Because Canada has been in trade talks with China and may potentially lower its tariffs on China which gives them a back door into the US. There are some specifics and it's all conditional. It depends on the kinds of deals it settles on.

I do feel as why demands reason and I am not sure if you can reason with the unreasonable which is what the Canadian speech was about in Davos and then POTUS threatened 100% tariffs again.

Kind of proved the point of America being an un-reliable partner which is what I inferred from Canadian PM's speech & his call for middle economies to connect with each other and strengthen together to have more leverage overall.

Probably bummed because nearly everyone (rightfully) praised Mark Carney's speech in Davos (in contrast to Trumps incoherent ramblings). I am pretty sure he can be that petty.

Because after the US threatened to destroy our economy and/or annex us by force and/or cancel nu-NAFTA and/or impose tariffs on us regardless, we realized that Americans don't actually want us as friends so we started diversifying our trade partnerships and negotiated a mutual tariff relaxation deal with China.

The previous Canada-US relationship is gone. Months ago I wrote on HN that purely by virtue of having to weather this storm, the nature of Canada-US relations will be irrevocably and fundamentally altered. Even if Trump and his cronies were jailed tomorrow, it's too late. The rest of the world understands that Trump is just a symptom of the disease affecting America and it's going to get worse, not better.

Delusion? Dementia? Being surrounded by yes-men?