**US-Canada trade tensions have escalated sharply since mid-2026, with 50% Section 338 tariffs on roughly $20 billion of Canadian goods taking effect August 22 after bilateral talks collapsed.** Canada responded with matching retaliatory tariffs on about $28 billion of U.S. exports effective September 8, raising rates on steel and aluminum to 50% and applying 15-50% duties on items including dairy, appliances, machinery, and clothing. The U.S. followed with product-list modifications effective September 15 and import bans on select Canadian goods effective September 29. No ministerial or official-level negotiations are currently scheduled, and further U.S. threats target Canadian autos and parts beginning January 2027. These verified actions under trade statutes, combined with stalled diplomacy and upcoming U.S. midterm elections, shape trader assessments of whether additional or sustained tariff increases remain in force.