The new Section 301 tariff investigations could redefine U.S. trade policy with Mexico and dozens of countries, affecting manufacturing, supply chains, and cross-border economies.
The United States has launched sweeping Section 301 tariff investigations that could reshape global trade—including with Mexico—after the Supreme Court ruled that the president cannot impose broad tariffs using emergency powers.
The investigations, announced in March by the Office of the United States Trade Representative, target dozens of trading partners and focus on two issues: forced labor in supply chains and industrial overcapacity in key manufacturing sectors.
The move comes weeks after the Supreme Court of the United States ruled in Learning Resources Inc. v. Trump that the White House lacked authority to impose sweeping tariffs under the International Emergency Economic Powers Act.
In the 6–3 decision, the Court reaffirmed that tariffs are effectively taxes, meaning Congress—not the president—holds primary authority unless lawmakers clearly delegate that power.
The ruling invalidated an estimated $170 billion in tariffs imposed in recent years, according to analysis cited by legal and trade researchers.
A New Legal Path for Tariffs
Trade experts say the administration is now pursuing a more traditional legal route.
Under Section 301 of the Trade Act of 1974, the U.S. government can impose tariffs after investigating whether foreign governments engage in unfair trade practices that harm American commerce.
“This is a more durable legal framework,” analysts at the Brookings Institution have explained in previous research on U.S. trade enforcement. Unlike emergency tariffs, Section 301 requires a formal investigation process that includes public hearings, written submissions, and economic analysis.
The first probe—announced March 12—examines whether governments are failing to prevent forced labor in supply chains. It covers about 60 economies, including Mexico and several Latin American countries.
A second investigation focuses on “structural excess capacity,” particularly in industries such as automobiles, steel, semiconductors, batteries, and solar panels.
Mexico in the Spotlight
Mexico’s inclusion reflects its central role in North American manufacturing and supply chains under the United States–Mexico–Canada Agreement.
In addition to the new investigations, U.S. officials are continuing to use the trade pact’s Rapid Response Labor Mechanism, which allows the U.S. to challenge alleged labor-rights violations at specific factories.
According to the trade office, recent reviews have examined facilities such as Superior Industries de México and Tubos de Acero de México, part of a broader effort to enforce worker protections negotiated under the USMCA.
Why the Investigations Matter
For businesses and workers across North America, the stakes are significant.
Mexico is the United States’ largest trading partner, with bilateral trade exceeding $800 billion annually, according to the U.S. Census Bureau.
If tariffs emerge from the new investigations, they could affect industries ranging from automotive manufacturing to electronics—sectors deeply integrated across the U.S.–Mexico border.
Public comments on the investigations are due April 15, with hearings scheduled in late April and early May. Trade officials aim to conclude their findings before July, when temporary tariffs imposed earlier this year are set to expire.
For Latino communities and businesses tied to cross-border trade, the outcome could shape the economic relationship between the United States and Latin America for years to come.
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