This weekend, President Trump announced his intention to increase tariffs on products imported from Canada by 10%. Canada has not done anything in the past four days to affect the strategic situation of the United States; we have committed no unfriendly acts, have not dropped the tariffs we agreed to impose on Chinese electrical vehicles, have, in fact, not done anything to affect the strategic or economic situation in the United States.
The Trump administration has at least stated their grievances honestly; they don't claim Canadians have done anything that would have a material effect on their economy. Their complaint arises solely from a series of advertisements the Ford government in Ontario has run. These ads correctly point out that the Trump policy of tariffs departs from the free trade policy advocated by Ronald Reagan, which gave rise to the so-called "Washington consensus" in favour of unrestricted trade and markets.
In other words, Donald Trump has imposed a 10% additional tax on Americans who use or depend on Canadian steel or aluminum, as well as many other products and commodities, and he has done it because an advertisement from a Canadian provincial government has offended him personally. He has imposed a tax on Americans, and said clearly he has imposed a tax on Americans, out of personal pique. In other words, he has claimed a power without much in the way of precedent: to use the authority of the United States government against a foreign government that offends him personally.

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