$20 billion of U.S. goods will face Canadian retaliatory tariffs from Jan. 1 after Trump threatened 50% duties on Canadian imports, widening a trade fight centered on the Detroit-Windsor manufacturing corridor.
$1 billion in goods crosses that border daily, and economists warn the integrated auto supply chain—where parts cross borders about six times—would spread pain through both countries, with U.S. automakers already absorbing an estimated $12.5 billion in tariff costs in 2025.
Michigan opposition is broadening as the political risk rises: a June Epic-MRA poll found residents oppose Canadian tariffs 63%-31%, nearly 75% say tariffs are driving up prices, and households there pay about $3,200 a year from tariff costs.
The backlash now reaches key Trump-aligned constituencies, with the UAW rejecting the latest escalation and Detroit business leaders warning the dispute could hurt Republicans in pivotal Michigan midterm races and hand Democrats an opening.