US markets showed a split reaction Monday as renewed trade tensions with Canada boosted steelmakers while pressuring car companies tied to cross-border supply chains.
Ford and Stellantis each fell 3% and GM lost 1% because US and Canadian auto production operates like one integrated factory, leaving tariffs to disrupt schedules, squeeze margins and eventually raise prices.
Cleveland-Cliffs, Nucor and Steel Dynamics rose on expectations that reduced Canadian competition could hand US steelmakers more market share, though they surrendered most of those gains by the close.
The Canadian dollar slid as much as 0.7% against the US dollar, signaling investors see Canada facing the larger growth hit if the dispute drags on.
For now, the broader US market is treating the flare-up as sector-specific, but prolonged retaliation could damage North America's trade infrastructure and weigh on margins, investment and consumer prices.