US-Canada trade war escalates as 50% tariffs hit $20 billion

US Commerce Secretary Howard Lutnick said Canadian Prime Minister Mark Carney abandoned trade negotiations for political reasons, as 50 percent tariffs on roughly $20 billion of Canadian goods took effect Saturday and Ottawa prepared dollar-for-dollar retaliation.

"We've recognized from the start that America has changed," Carney said in Ottawa on Saturday. "We recognize that sometimes, its signature is written in pencil." The prime minister blamed disunity within the Trump administration for the breakdown, saying his team was "unified" while "you cannot say that about the United States administration."

The tariffs hit Canadian wine, hockey sticks, cement, wood products and alcohol. Trump has threatened to double duties on Canadian cars, trucks, auto parts and steel to 50 percent effective New Year's Day, and Canada said it will unveil retaliatory tariffs on US steel, dairy, appliances, agricultural equipment, pulp and paper, and electronics on Sept. 8.

The breakdown leaves the two largest North American trading partners — whose annual two-way trade exceeds $700 billion — locked in an escalating cycle of retaliation. US farmers rely on Canada for nearly 80 percent of the potash fertilizer they use each year, northern border states run on Canadian hydropower, and Midwestern refineries process heavy Canadian crude, according to the US Geological Survey and the Federal Reserve Bank of Kansas City.

Lutnick Blames Politics, Carney Points to Turf Wars

Lutnick, whose Commerce Department administers the national security tariffs at the center of the dispute, said Carney left the table "due to numerous political factors" and that the Canadian government sought to re-engage after a separatist vote. The comments came as both sides traded blame for the collapse of a framework deal that President Donald Trump had touted on social media just three days earlier.

The negotiations exposed friction between US Trade Representative Jamieson Greer and Lutnick over which agency controlled key concessions. Lutnick objected to Canadian proposals that would lower tariffs on autos and aluminum derivatives, and the US side pushed to exclude heavy trucks produced at Ford and General Motors plants in Ontario from any relief, according to The New York Times and Bloomberg.

Carney said the US offered "no rationale" for the carveouts, which would have made it "more uneconomic" for automakers to keep building vehicles in Canada. The administration also sought to restrict Canada's ability to strike trade deals with third countries — a key part of Carney's strategy to reduce dependence on its southern neighbor — and to roll back protections for French-language content.

Trump, who has repeatedly suggested Canada should become the 51st US state, accused the country of "ripping off the United States of America for years" on Truth Social. "They do 95% of their business with the U.S., with us, the exact opposite!" he wrote.

Tariffs Land Before Midterms

The duties come less than three months before the Nov. 3 midterm elections, which polls show are expected to turn on voters' frustration with the rising cost of living. Small US businesses face an especially sharp cash crunch, as they must pay tariffs before their customers pay them 30 or 60 days later, said Jason Miller, a professor of supply chain management at Michigan State University.

"I expect a significant drop in a lot of these different import categories because importers simply can't afford to bring them in," Miller said. "That may mean certain products not on the store shelves."

The last time the US imposed sweeping tariffs on Canada under the 1930 trade law, the dispute was resolved within weeks through the USMCA framework. This time, no new talks are scheduled, and the administration must manage a cycle of retaliation while facing potential legal challenges to the never-before-used tariff authority.

"It's a big setback for Trump's trade policy," said Wendy Cutler, a former US trade negotiator now at the Asia Society Policy Institute. "We're at a juncture where other countries may be very closely watching how this plays out."

This article is for informational purposes only and does not constitute investment advice.