North American Trade Agreement Fracture: US-Mexico Bilateral Talks and the Supply Chain Logic Behind Canada's Marginalization

The Fission Moment of the North American Trade Agreement

On July 21, 2026, the United States and Mexico launched the third round of USMCA bilateral negotiations in Mexico City, while Canada was not only excluded from the negotiating table but also faced a new round of tariff strikes from the Trump administration. This event marks the North American regional trade system entering an unprecedented phase of fragmentation. Since the Trump administration refused to extend the USMCA’s six-year terms on July 1, 2026, the agreement has entered a 10-year countdown unless the three countries reach a consensus on amendments. Now, the bilateral path replaces the trilateral framework, revealing the U.S. trade policy's redefinition of “friendshoring” and “adversaries.”

Supply Chain Perspective: The Automotive Industry Bears the Brunt

One of the focal points of the negotiations is the review of rules of origin, particularly for the automotive industry. U.S. Trade Representative Jamieson Greer made it clear that Trump’s primary goal is to reduce the trade deficit in goods with Mexico and Canada and to bring more manufacturing back to the United States. Data from 2025 shows that the U.S. trade deficit with Mexico further expanded by 17% to $197 billion, while the deficit with Canada decreased by 21% to $48.3 billion. This asymmetry has led Washington to target Mexico while pressuring Canada with tariffs.

At the supply chain level, automakers’ layouts are being reshaped by policy forces at an accelerated pace. Greer cited cases such as Toyota’s expansion of its plant in Texas, indicating that some automakers have begun to shift assembly capacity back to the United States. However, a more complex challenge lies in how regional parts flows, cross-border logistics networks, and inventory strategies will be reconfigured under new tariff and rule uncertainties. In the short term, the freight efficiency at U.S.-Mexico border crossings (such as the Zaragoza Bridge in El Paso–Juárez) will be directly impacted by the negotiation outcomes; in the long term, the North American automotive industry chain may split into a two-tier structure of “U.S. core” and “Mexican subsidiary,” with Canada facing the risk of being squeezed out of the core supply chain.

Trade Policy Logic: Bilateralization and “De-risking”

The core topics of the U.S.-Mexico bilateral talks include raising local content requirements for automobiles and establishing barriers to transshipment of Chinese goods. This indicates that the U.S. is trying to use the USMCA as a tool to completely block the circuitous entry channels for Chinese-made products. By 2025, U.S. imports from Mexico already included a large number of intermediate goods, some of which were produced with Chinese capital or technology involvement. Limiting “third-country” content will force assembly plants and parts suppliers to accelerate their relocation to the North American continent, which is both a reshoring of manufacturing and a geoeconomic decoupling.

At the same time, the strategy of imposing new tariffs on Canada has a “coercive” nature—pressuring Ottawa to make concessions on long-standing disputes such as dairy market access and digital services taxes. Canada is not a passive beneficiary of the USMCA; its exports of steel, aluminum, and auto parts are deeply intertwined with U.S. industry. Tariffs will raise cross-border logistics costs and may trigger retaliatory measures, further tearing apart the previously unified North American logistics network.

Long-term Outlook of the Regional Trade SystemThe U.S. Chamber of Commerce warns that the trilateral structure of the USMCA, zero tariffs, and strong enforcement support $1.6 trillion in intraregional trade. Abandoning the trilateral framework means companies will face fragmented rules of origin, varying tariff levels, and more complex compliance costs. For global companies reliant on North American supply chains, the flow of goods from semiconductors to agricultural products will be disrupted.