But there’s no long-standing frustration or gripe in Donald Trump’s old tweets, which can sometimes be a clue to his frustrations.

“This is not only a personal issue between Prime Minister Trudeau and President Trump; it’s way more than that,” Joly told Amanpour. “It is much more than just the political rhetoric. It is a fundamental threat,” she said, adding that one result will be the breaking down of barriers to trade between Canadian provinces and closer relationships with Europe.

During his first term, Trump spent a lot of time bragging about the USMCA, the trade pact he negotiated but is now breaking by imposing new tariffs on Canada and Mexico.

Canadians sour on the US

Most Americans may not give much thought to Trump’s idea to turn Canada into a state, but Canadians are taking this very seriously, as anyone who has seen booing at NHL games or removal of US booze from Canadian shelves will tell you.

Nobody in the US is talking about an invasion force, but most Canadians (63%) say Trump should be taken seriously in a survey conducted by Leger for the Association for Canadian Studies. A little more than half say they would defend Canada from military invasion.

More important is the striking drop in the number of Canadians who view the US favorably, from more than 50% in June to one-third today.

A shock to the political equilibrium in the US

Canada’s population exceeds that of California, the most populous US state, and if it were admitted to the US as a single entity rather than as 10 separate provinces, it would instantly upend the political equilibrium in today’s nearly evenly divided US system.

It’s relatively simple in the Constitution to welcome a state into the US, but it hasn’t been done since 1959, when Hawaii and Alaska both became states.

The addition of those two states at nearly the same time helped maintain equilibrium in the US. Back then, Alaska veered toward Democrats and Hawaii veered toward Republicans, according to a Senate history. That’s the opposite of today’s political picture.

Both were also small states, and both held a plebiscite to guarantee that local voters agreed with becoming a state, something most Canadians seem to oppose. For starters, it’s an intentionally bilingual country, and Trump recently declared English the national language of the US.

“We were part of the British Empire because we didn’t want to be the United States,” Joly told Amanpour.