Michigan added 500 jobs in the 12 months through June. Texas added 177,900. That gap framed the backdrop as President Donald Trump defended his tariff regime before General Motors employees at the automaker's Milford, Michigan proving-ground facility on Monday, hours after the first commercial truck — carrying auto parts bound for Michigan — crossed the newly opened Gordie Howe International Bridge between Detroit and Windsor.

Trump used the appearance, one of a series of rally-style events ahead of the November midterms, to argue that his tariffs are rebuilding the American auto industry. "The rule is straightforward: Build your trucks or cars outside the United States and you'll pay a fee for the right to sell them here and profit," he said. "Build your plant in Michigan or anywhere else in America and produce your vehicles right here at home, and you'll face no tariff at all."

The tariff structure now bearing down on the sector is substantial. A 25% levy applies to non-US content in Canadian-assembled passenger vehicles, plus parts that fall outside the USMCA trade pact. Steel tariffs add indirect cost. Canada has retaliated with 25% tariffs on US vehicles and USMCA-non-compliant parts.

And the burden is set to grow. Washington has signalled a planned increase to 50% on some Canadian goods, including autos, in August — a move that would land directly on a Michigan economy tethered to cross-border parts flows through Detroit and Windsor, the two countries' auto manufacturing capitals.

The White House pointed to GM's $6bn investment in US manufacturing — the figure cited in a corrected version of its statement — as evidence the policy is working, alongside smaller commitments from Ford, Stellantis and Detroit Diesel. Those are announced intentions from the OEMs, confirmed by the administration; how much of that capital directly offsets tariff costs, rather than reflects prior product programs, remains to be tested against actual production data.

The production numbers so far point the other way. Vehicle output fell last year in all three North American countries, with Canada posting the steepest decline at 5.4%, according to an analysis by TD Bank. Automakers have begun reworking their production lines in response to the tariff walls.

Michigan's labour market data complicates the White House narrative further. Bureau of Labor Statistics figures show the state gained just 500 jobs in the year through June. The state's unemployment rate stood at 5.1% in May, up slightly from April — a level matched or exceeded only by Illinois, Nevada, California, Connecticut, Oregon and Washington.

Trump, speaking in a state that swung Republican in 2024 and remains a midterm battleground, told the assembled GM workers that "at long last, Michigan finally has a president who stands up for Michigan autoworkers." He blamed the state's remaining economic troubles on "globalist" politicians who he said "sold out" American workers.

Tariffs are not the only pressure on Michigan households. Inflation and rising gasoline prices tied to the Iran war have fed anxiety in auto-dependent communities across the state — a political liability the president's opponents intend to press in November.

For manufacturers and suppliers, the near-term calculus is straightforward. The August decision on raising Canadian auto tariffs to 50% is the variable that matters most. A doubling of the levy would force a fresh round of sourcing decisions across the Detroit–Windsor corridor, where the new Gordie Howe bridge has just opened a critical piece of freight infrastructure into precisely the trade environment it was built to serve.

What to watch next: the August tariff decision, GM's spending breakdown for the $6bn commitment, and whether Michigan's payroll figures turn before the November midterms.