In 2013, I wrote a book about how Canada’s economic dependence on the U.S. in the form of a lopsided trading relationship was also a strategic vulnerability. Now we know why. It’s 2026, and Donald Trump is making a move, but fortunately Canadians have some cards.

Canadians are furious about tariffs and Trump’s “51st state” insults and bullying. The result is that the majority support retaliatory tariffs. Trump scoffs, but Canada has leverage.

Up to 30 U.S. states trade or import electricity from Canada and all major regional grids outside Texas are interconnected across the border. Fossil fuels are another critical commodity that Canada provides — roughly 60% of all America’s oil imports and 98% of its natural gas imports.

Of course, cutting off energy exports is not possible and would endanger Americans. But Canada could slap export taxes on all forms of energy and other vital commodities to increase their prices, which would hurt the U.S. economy and its........

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