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WASHINGTON — The U.S. cities most vulnerable to a trade war with Canada turn out to largely be in the states that helped return Donald Trump to the White House — a sign of the possible political risk he’s taking with his tariff plans.

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A new analysis released Thursday by the Canadian Chamber of Commerce detailed the areas most dependent on exports to Canada, with San Antonio, Tex. and Detroit topping the list of 41 U.S. metro areas. The findings show that the United States’ 25 per cent tariffs on Canada and Canada’s retaliations could inflict meaningful damage in key states for U.S. politics.

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The analysis was conducted before the Republican president announced Wednesday that he was placing additional 25 per cent tariffs on imported autos and parts starting on April 3.

“The consequences of today’s escalation in this destructive tariff war will not be contained to Canada, as much as the U.S. administration would like to pretend,” said Candace Laing, president and chief executive of the Canadian Chamber of Commerce. “Throwing away tens of thousands of jobs on both sides of the border will mean giving up North America’s auto leadership role, instead encouraging companies to build and hire anywhere else but here. This tax hike puts plants and workers at risk for generations, if not forever.”

Nearly half of what San Antonio exports, with its aerospace, auto and energy sectors, goes to Canada. About 40 per cent of what the auto-driven Detroit area exports also goes to Canada. Trump’s wins in Michigan, Pennsylvania and Wisconsin were crucial for his overall victory in November’s presidential election — and Milwaukee and Pittsburgh also rank in the top 10 for exposure to a trade war with Canada.

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Other cities most dependent on exports to Canada include Kansas City, Mo.; Louisville, Ken.; Nashville, Tenn.; Columbus, Oh.; Chicago, Ill.; and Cleveland, Oh. All of those states aside from Illinois backed Trump in the last election.

Trump has placed 25 per cent tariffs on many goods from Mexico and Canada, with a lower 10 per cent tax on energy products from Canada. Some of those tariffs have been suspended or delayed, though they’re set to fully hit in April.

Canadian leaders have warned that the U.S. would suffer in the form of higher prices, fewer jobs and slower growth because of the trade war. But an analysis by the Brookings Institution found that the economic pain would be more severe in Mexico and Canada because those countries are more reliant on the U.S. in terms of trade.

Trump’s stated reason for the tariffs is to stop illegal immigration and drug smuggling, though he’s also said that he dislikes the trade deficit with both countries and has taunted Canada by suggesting that it could become the 51st U.S. state.

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