US-Canada Trade Standoff Deepens as Tariffs and Threats Escalate

The longstanding economic partnership between the United States and Canada has deteriorated sharply since trade negotiations broke down on August 21, with President Donald Trump accusing Canada of cheating American workers and industries.

Trump has imposed 50% tariffs on $20 billion worth of Canadian goods, citing discrimination against US auto, dairy, and alcoholic beverage exports. When Ottawa retaliated with its own tariffs on Tuesday, Trump escalated further, threatening to cut Canadian companies off from US government contracts and to ban imports of motorcycles, certain dairy products, and most alcoholic beverages.

The dispute marks a jarring turn for Canada, whose trade equals 64% of its economic output, compared with 25% for the United States. Most US goods enter Canada duty-free under the US-Mexico-Canada Agreement (USMCA) that Trump negotiated in his first term. Canada's effective tariff rate on US imports was about 2.4%, less than half the 5% the US imposed on Canada, according to Oxford Economics.

Despite its overall openness, Canada maintains protections in a few sectors. Its dairy industry operates under a supply management system that imposes tariffs exceeding 200% on most dairy products once quotas are exceeded. Trump claimed falsely on social media Tuesday that Canada does not allow US dairy farmers to sell into its market. In fact, the USMCA preserved Canada's supply management system in exchange for greater US access, and US dairy exports to Canada rose more than 11% last year after an 8% increase in 2024, according to the US Department of Agriculture. The US runs a dairy trade surplus with Canada, exporting $1.3 billion worth of products last year while importing $585 million.

Overall, the US runs a trade deficit with Canada—$27.3 billion last year—largely due to oil. Canada exported more than $85 billion worth of crude oil to the US in 2025, with Midwest refineries dependent on heavy sour crude from Alberta's oil sands. "It's the only oil they can use," said Barry Appleton, co-director of New York Law School's Center for International Law, noting that switching to other sources would take years and billions of dollars.

The two economies remain deeply intertwined. Canada sends about 70% of its exports to the US, which relies on Canadian potash fertilizer and electricity. Analysts see a possible opening for talks: the US ban on some Canadian products does not take effect until September 29. "This is not going to happen for three weeks," said Inu Manak, senior fellow at the Peterson Institute for International Economics. "There could be a way out of this."

Canadian Prime Minister Mark Carney said his country remains open to an agreement: "Canada is always ready to strike a fair deal." But Trump is also pressing Canada to surrender some manufacturing to the US—a tough sell in Ottawa. "If you want to take all our jobs and industry away, then why would I cooperate with you?" Manak said.

Appleton warned that the standoff jeopardizes the USMCA, which has created a thriving integrated automotive industry across the three North American countries. "We had the best integrated North American economy going," he said. "And now we don't."