Trump revives a forgotten 1930 tariff law in a fresh showdown with Canada

When Donald Trump announced on July 20 that the United States would slap fresh duties on Canadian automobiles, he didn’t just reach for a modern‑day tool – he dusted off a relic from the Great Depression. The legal anchor? Section 338 of the Smoot‑Hawley Tariff Act of 1930, a provision no president has ever actually used.

The administration frames the move as a necessary response to what it calls “discriminatory” Canadian tariffs – a 25 % levy on U.S. cars and auto parts that, in Washington’s view, unfairly hampers American manufacturers.

But the numbers tell a more nuanced story. Trade data show that, despite the Canadian tax, the United States remains Canada’s biggest source of imported vehicles. Imports of U.S. autos have bobbed up and down over the past year, ending roughly where they started in April 2025. Meanwhile, imports from Mexico, Japan, South Korea and Germany have barely budged.

One plausible explanation for the modest dip in U.S. auto shipments isn’t the tariff at all – it’s consumer behavior. A recent Toyota Canada survey found that 56 % of Canadians are postponing big‑ticket purchases, cars included, because of affordability worries. Automotive‑industry data confirm a slight, 1 % decline in new‑car sales across Canada, a trend that hits all makes, not just American ones.

Even the story of auto parts looks less dramatic than the administration’s rhetoric suggests. Over the last twelve months, Canadian imports of U.S. auto components have hovered within their historical range, even spiking in the first quarter of 2026. In fact, the value of U.S. auto‑parts exports to Canada has often matched or exceeded that of finished vehicles.

All this points to a paradox: while both sides have erected 25 % tariffs on each other’s auto goods, the real economic pain is likely being felt by consumers who now pay higher prices, not by the auto sector itself.

Critics argue that the tariff war is a self‑inflicted wound. The original U.S. duties, announced in the “Liberation Day” executive order of April 2025, triggered Canada’s retaliatory tax. Now Trump’s Section 338 response simply deepens a cycle that benefits no one but tariff‑collecting agencies.

History has taught us that such tit‑for‑tat trade skirmishes rarely produce winners. In the end, the burden lands on the people who buy the cars – on both sides of the border.