The USMCA Joint Review isn't a one-day event — it's a running negotiation, and this week is its third bilateral round. Ambassador Greer traveled to Mexico City for talks running July 21–24, following two prior rounds. The U.S. Chamber of Commerce has submitted formal comments on the review, putting the business community's position on record while the negotiating teams work.
The proposal drawing the most pushback: tightening USMCA's rules of origin specifically to squeeze Chinese-sourced content out of qualifying supply chains. Mexican manufacturers — especially in the Bajío corridor (Querétaro, Guanajuato, Aguascalientes) — are fighting it hard, warning that it raises costs across nearshoring operations that only recently stabilized after years of buildout.
This is the most consequential live commercial-diplomacy process in Mexico right now — more important, this quarter, than any single deal or auction.
USMCA tariff-free access for qualifying goods isn't in question — it's already in force, and Ambassador Johnson remains actively engaged on commercial facilitation. What's actually being renegotiated is the definition of "qualifying." Rules-of-origin thresholds determine how much Chinese input — components, sub-assemblies, raw materials — a product can contain and still cross the border duty-free under USMCA. Tighten that definition, and manufacturers who built supply chains assuming today's rules face a choice: re-source at higher cost, or lose preferential access.
A rules-of-origin tightening cuts two ways. In the near term, it raises compliance costs for nearshored manufacturers who are only now finding their footing — real money, on a live timeline, for anyone sourcing components from China. Longer term, it structurally favors US-aligned manufacturers over Chinese-linked supply chains, which is exactly the point of the exercise from Washington's side. Layer on top of that a separate, ongoing risk: cartel fragmentation following El Mencho's death in February has left transitional insecurity in specific corridors, including parts of Jalisco — a security assessment, not just a trade one, before any operational deployment there. Map your supply-chain exposure to Chinese-sourced inputs now, before the fourth round locks in a direction. Waiting for the outcome to be final costs you the positioning window, not just the news cycle.
Sourcing Through Mexico?
Know What Rules of Origin Actually Cost You.
The review is live through the fourth round. Positioning now, before the rules lock in, is the difference between adapting and re-sourcing under pressure.
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