**Ongoing US-Canada trade tensions center on elevated tariffs imposed under Section 338 of the Trade Act of 1930 and matching Canadian retaliatory measures.** After negotiations collapsed in August 2026, the United States applied 50% duties on roughly $20 billion of Canadian imports, prompting Ottawa to impose equivalent countermeasures on US goods effective September 8. Recent bilateral talks in early October sought to reduce auto tariffs toward 15% and halve steel and aluminum rates, but progress has been limited by disagreements over dairy, alcohol restrictions, and third-country trade limits. Canadian public opinion and provincial premiers have resisted further concessions, while the USMCA joint review continues without a 16-year extension. New US auto tariff threats loom for January 2027, and any diplomatic breakthrough would likely require addressing these sectoral disputes before additional deadlines or escalation. Trader sentiment reflects uncertainty over whether talks can produce verifiable tariff reductions amid these entrenched positions.