Mexico lost its position as the largest supplier of passenger cars to the United States in July, when Japan and South Korea moved ahead. Researcher Diego Marroquín Bitar argues that US automotive tariffs are weakening the North American production system they are supposed to protect.
Between January and July 2026, the value of US passenger-car imports from Mexico fell 20 per cent compared with the same period in 2024. The decline contrasts with a nearly 24 per cent increase in total US goods imports from Mexico, isolating the damage inside the automotive sector.
Mexican vehicles contain about 40 per cent US-made components on average, far more than many cars imported from outside the region. Marroquín told the US International Trade Commission that reducing Mexican production can therefore reduce demand for American parts rather than relocate complete value chains northward.
The broader USMCA record points in the opposite direction from contraction. Intraregional trade has grown at least 37 per cent since the agreement entered into force, while foreign direct investment in the region rose 16 per cent between 2019 and 2024.
Marroquín warned against raising regional-content thresholds, imposing specific US-content mandates or taxing trade that already complies with USMCA. Each additional condition reduces the commercial value of preferential treatment and may encourage manufacturers to place production outside North America altogether.
He instead proposed targeting sectors where the region remains dependent on foreign suppliers. Current automotive rules were designed around mechanical parts, even though a rising share of vehicle value now lies in semiconductors, sensors, displays, electronic circuits and software.
The coming review therefore faces a strategic choice. Tariffs can penalise an integrated industry that uses substantial American content, or origin rules can be modernised to build regional capacity in high-value electronics. Mexico's lost monthly lead is an early measure of that decision's cost.
