US-Canada trade war deepens as tariffs reshape North American economy

Eighteen months into his second term, President Donald Trump has remade the trading relationship between the United States and Canada into something neither country has seen in decades. The tariffs started early and have only widened. Steel, aluminium, lumber, automobiles—entire sectors that built the continental economy now move across the border under a tax that wasn't there before. Last week, the Trump administration added another layer: a 50% levy on roughly C$28 billion worth of Canadian goods. Canada responded on Tuesday with its own counter-tariffs, matching the American moves dollar-for-dollar and, by design, aiming at swing states that will decide the midterm elections.

The damage is already visible on the ground. In Ontario, the country's most populous province and home to a sprawling manufacturing base, auto parts plants and assembly lines have announced layoffs and production cuts. The province has shed tens of thousands of manufacturing jobs since early 2025. Quebec's metal sector—steel, copper, aluminium—saw exports collapse by 36% between February 2025 and 2026, with employment in the sector dropping 3.6%. The Royal Bank of Canada estimates that Ontario and Quebec bear the brunt of the sectoral tariffs, though the latest round of American duties will ripple through every province. British Columbia, Quebec, and Ontario will feel it most acutely.

Canada's retaliation is not random. Economists note that the counter-tariffs appear deliberately calibrated to hit swing states hardest. Ohio faces tariffs on C$3.2 billion of its exports—12% of the state's total—with steel and laundry machines taking the heaviest blow. Illinois, home to John Deere, will see farm and construction equipment taxed. Pennsylvania rounds out the trio. Derek Holt, an economist at Scotiabank, observed that Canada's strategy looks "very deliberately oriented" toward states that could swing the balance of power in Washington. The US economy is far larger than Canada's, so the American pain will be less acute overall, but it will be concentrated and visible.

Canada has long enjoyed the lowest tariff rates among major US trading partners. In June, the average effective US tariff on Canadian goods sat at 2.9%. That figure has now nearly doubled to 5.7%, surpassing Mexico's rate and approaching what the UK and Vietnam face. China still bears the heaviest load at around 20.5%. For Canadian households, the math is straightforward: the Tax Foundation estimates that an American family will pay roughly $840 more this year due to Trump's tariffs across multiple countries, including Canada. Canadian counter-tariffs are more narrowly targeted to spare consumers, but manufacturers will absorb higher costs for industrial supplies imported from the US.

The trade war is forcing a fundamental reorientation of Canadian business. For decades, proximity to the world's largest economy and free trade agreements dating to the 1980s created one of the world's most tightly integrated trading relationships. The US buys more than 70% of Canadian exports. That dependency is now a liability. Prime Minister Carney has pledged to double Canada's non-US exports over the next decade, and some businesses are already moving. Matteo Sgaramella, who runs a Toronto menswear company called Outclass, has shifted his trunk shows from New York to Paris. European retailers, he told the BBC, are enthusiastic about stocking Canadian products partly because Canada is "standing up to the Americans right now." Bank of Canada data shows Canadian firms are indeed exporting more to countries outside the US since Trump returned to office in January 2025.

But diversification is not equally available to all. Ontario manufacturing cities like Oshawa, London, and Kitchener-Cambridge-Waterloo remain deeply wired into the US market, and growth in non-US exports has been too limited to offset the broader collapse in trade activity. The Canadian Chamber of Commerce flagged these regions as particularly vulnerable. Yet the overall picture is not uniformly bleak. Foreign direct investment into Canada hit C$96.8 billion in 2025, the highest inflow since 2007. Canada's GDP rebounded to 3.3% growth in the second quarter of 2026, driven by a jump in exports and domestic investment. Employment has risen in sectors not exposed to US tariffs. Carney is betting on momentum: his government will host the first-ever Canada Investment Summit in Toronto in September, bringing major investors and CEOs to pitch the country as a stable alternative to US-tied manufacturing.

The human cost, though, is already substantial. Bank of Canada data shows that Canada has lost approximately 55,000 manufacturing jobs between January 2025 and January 2026. Calgary-based economist Trevor Tombe estimates that if the new 50% US tariffs persist, total job losses could reach 90,000 across the country. In the US, the Center for American Progress estimates that Trump's tariffs have already cost tens of thousands of jobs in manufacturing, transportation, and warehousing. A Canadian American Business Council analysis warns that if the two countries allow the USMCA—the continental trade agreement—to fail, the losses would multiply. For now, neither side shows signs of backing down. The tariffs remain in place, the counter-tariffs are live, and the question is no longer whether the trade war will reshape North American economics, but how much deeper it will cut before either government finds reason to negotiate.