The United States has escalated its trade dispute with Canada, the world’s largest buyer of US goods, after President Donald Trump imposed 50% tariffs on Canadian products worth 20 billion dollars. Ottawa responded with countermeasures, marking a sharp turn in a deeply integrated economic relationship.
Escalation after talks collapse
Relations have deteriorated since trade talks broke down on August 21, with the Trump administration accusing Canada of discriminating against US car exports, dairy products and alcoholic beverages. After Ottawa imposed retaliatory tariffs, Trump threatened to exclude Canadian companies from government contracts and ban some Canadian products.
Canada is the second-largest market for US agricultural exports after Mexico, while most US products enter Canada tariff-free under the United States-Mexico-Canada Agreement.
Dairy at the heart of the dispute
Canada relies heavily on foreign trade, which accounts for about 64% of its economic output, compared with 25% in the United States, according to World Bank data. Despite its open economy, Ottawa strongly protects certain sectors, foremost among them dairy.
Canada imposes tariffs of more than 200% on most dairy products once specified import quotas are exceeded, with rates approaching 300% for some products such as butter. In contrast, the current trade agreement has given US producers greater access to the Canadian market, with US dairy exports to Canada rising by more than 11% last year after increasing 8% in 2024.
The United States runs a dairy trade surplus with Canada, exporting products worth 1.3 billion dollars last year, compared with imports worth 585 million dollars.
Oil explains the trade deficit
The US trade deficit with Canada, which stood at 27.3 billion dollars last year, is largely linked to oil imports. Canada exported more than 85 billion dollars of crude oil to the United States in 2025, while refineries in the US Midwest rely on the high-sulfur heavy crude produced in Alberta.
A trade law expert said the refineries are designed to process Canadian crude, and switching to other types could take years and require billions of dollars, while Canadian oil is sold at a discount to the US benchmark crude.
Canada sends about 70% of its exports to the United States, while US refineries need Alberta oil and farmers need Canadian potash. Border regions in the United States also rely on electricity generated in Canada, underscoring the extent of the two economies’ mutual dependence.
A window for negotiations before September 29
A window for negotiations remains open before some US measures take effect on September 29. Canadian Prime Minister Mark Carney said his country was prepared to reach a fair agreement, amid warnings that a prolonged confrontation could threaten the integrated trade and industrial system built by the North American countries.
