Canada’s trade confrontation with the United States has intensified after President Donald Trump imposed 50% tariffs on $20 billion of Canadian products and threatened additional import bans following the collapse of trade talks on Aug. 21. The measures target disputes over Canadian policies affecting U.S. auto, dairy and alcoholic beverage exports, while Canada has retaliated with tariffs of its own. The conflict is notable because Canada buys more from the United States than any other country, sends about 70% of its exports south, and generally maintains a highly open economy. Canada’s overall trade equals 64% of economic output, compared with 25% for the United States, while its effective tariff rate on U.S. imports was about 2.4%, versus 5% imposed by the United States, according to Oxford Economics. Most U.S. exports enter Canada duty-free under the USMCA (United States-Mexico-Canada Agreement), which took effect on July 1, 2020. Canada does maintain strong protections for dairy, including tariffs above 200% once quotas are exceeded, but U.S. dairy exports to Canada rose more than 11% last year after increasing 8% in 2024. The United States also recorded a $1.3 billion dairy trade surplus with Canada last year. Overall, however, the U.S. ran a $27.3 billion trade deficit with Canada, largely because it imported more than $85 billion of Canadian crude oil in 2025 for refineries in the Midwest that are designed to process Alberta’s heavy sour crude. Both countries have economic incentives to reach an agreement, and negotiations could resume before the U.S. restrictions take effect on Sept. 29. Canadian Prime Minister Mark Carney said Canada remained ready for a fair deal, while Trump said an agreement could come soon if Canada lowers tariffs on American farmers.