Fifty-percent tariffs on roughly $20 billion worth of Canadian goods hit Saturday after days of negotiations collapsed, with Washington and Ottawa each blaming the other for the breakdown.

U.S. Trade Representative Jamieson Greer said Friday evening that Canada had refused to close a deal that both sides had effectively agreed to earlier in the week. Canadian Prime Minister Mark Carney fired back within hours, accusing the United States of introducing last-minute changes that made any agreement unreliable. Neither side scheduled further talks, and the tariffs, originally set to take effect Wednesday before President Trump granted a three-day extension, went into force as the deadline expired.

Carney then suspended negotiations entirely and ordered Canada's trade team back to Ottawa. He vowed retaliatory tariffs matching the U.S. levies "dollar for dollar to protect our workers and businesses." The result is the sharpest escalation in the U.S.-Canada trade relationship in at least eighteen months, and neither government appears ready to blink.

Greer says Canada walked away from the best offer on the table

Greer's Friday-night statement laid responsibility squarely on Ottawa. He said the administration had offered Canada "significant tariff reductions on steel, aluminum, autos and lumber" in exchange for Canadian concessions on longstanding trade barriers. The White House had alleged "discriminatory treatment" by Canada against American alcohol, automobile, and dairy products, complaints that U.S. producers have raised for years.

In a separate appearance, Greer told Fox News that his priority was "protecting American workers and protecting American supply chains." He added bluntly: "They've always had the best deal, and they still would have an even better deal, but they didn't want that."

A senior U.S. official, speaking on condition of anonymity, said Canada had sought additional concessions the United States was unable to provide. The official characterized the talks as candid and not hostile, but confirmed no new meetings were planned.

The tariffs cover approximately 5.5 percent of Canadian exports to the United States, hitting products that include alcohol and hockey skates, among other goods. Existing U.S. duties on Canadian steel, aluminum, and automobiles remain in place on top of the new levies.

Carney blames 'last-minute changes' and suspends talks

Carney's account of the breakdown differs sharply from Greer's. The Canadian prime minister said Washington altered its proposed terms at the last minute in ways that were "unfair, uneconomic, and called into question the reliability of any deal."

He outlined three specific objections. The Washington Examiner reported that Carney cited U.S. attempts to exclude medium- and heavy-duty trucks from auto tariff protections, restrict Canada's ability to strike trade deals with other nations, and limit Canadian language and cultural protections. Greer's office disputed that account, maintaining that Canada walked away from a deal already in place and introduced new demands of its own.

Carney acknowledged that the two sides had made "important progress" in recent weeks but said it "has not been enough to meet our objectives for Canadians." He has repeatedly told Canadians that the country's relationship with the United States has been "forever changed" and that Canada must diversify its trade partnerships. Roughly 70 percent of Canadian exports currently go to the United States, a dependency Carney has framed as a strategic vulnerability.

The tone from Ottawa grew more combative in the days that followed. Carney later described the tariff dispute in stark terms, saying Canada had been "attacked" and declaring the situation a trade conflict. The New York Post reported that Carney announced retaliatory tariffs set to take effect September 8, matching U.S. duties dollar for dollar. Trump responded on Truth Social, writing that Canada "wants the benefits of being a State, without being one" and accusing the country of charging American farmers "massive amounts of Tariffs" for years.

Three days of talks in Washington produced nothing

Canada's top negotiator, Dominic LeBlanc, had been camped out in Washington for days of intensive talks. He and Greer met for roughly three hours on Thursday. On Friday, after another long session, LeBlanc told reporters that officials still "have more work to do", a diplomatic understatement that, by evening, had given way to mutual recrimination.

Trump had originally set the tariffs to take effect Wednesday but granted a three-day delay, citing major progress in the negotiations. That extension bought time but did not produce a deal. The administration has been willing to push hard on North American trade policy, having already declined to renew the existing U.S.-Mexico-Canada trade agreement in its current form. Both countries still need to agree on revisions to that pact.

The trade tensions extend beyond tariffs on goods. Canada's regional leaders had already removed U.S. alcohol and wine from provincial liquor stores as a retaliatory measure. Greer accused Canada of maintaining "prolonged retaliation" against the United States, including prohibitions on certain American goods and services.

Existing U.S. tariffs on Canadian aluminum have already contributed to a 58 percent increase in aluminum prices in the United States, AP News reported, a cost ultimately borne by American manufacturers and consumers. That price pressure will only intensify with the new 50 percent duties layered on top.

Analysts warn both sides face pressure to find an exit

Trade analysts who spoke to AFP cautioned that the mutual escalation makes a resolution harder, not easier. Ryan Majerus, a former U.S. commerce official now with the law firm King & Spalding, put it plainly:

"If Canada has agreed to also impose retaliatory tariffs, that will make deescalating this a lot harder. But I think both sides will face significant pressure in the coming days to find an off-ramp."

Christopher Padilla, a former U.S. official now with the advisory firm Brunswick Group, said there had been "a lot of hope among businesses on both sides" for a deal that would "turn the page on what has been a very difficult eighteen months in the US-Canada relationship." That hope evaporated Friday night.

The administration has shown a consistent willingness to use aggressive trade tools, including century-old tariff statutes, to press trading partners into better terms for the United States. The New York Post reported that the latest tariffs were imposed under Section 338 of the Tariff Act of 1930, covering an estimated $28 billion worth of Canadian imports including beer, cheese, and electronics when combined with existing duties.

Trump himself said the United States "should be able to have a deal with Canada," citing his "good relationship" with Carney. But that optimism has not translated into a signed agreement, and Carney's decision to recall his negotiators signals Ottawa is digging in rather than conceding.

Just The News reported that the tariffs took effect late Friday night, with Canada immediately retaliating by suspending negotiations and ordering counter-tariffs on American products. Greer confirmed no new talks with Canada are currently planned.

The standoff leaves major questions unanswered. What specific concessions did Canada demand that the U.S. could not provide? What exactly were the "last-minute changes" Carney found unacceptable? And with no meetings on the calendar and retaliatory tariffs stacking up on both sides, who blinks first?

The administration has won court battles to keep its tariff framework intact, and it has shown no interest in backing down from trade disputes with allies or adversaries alike. Canada sends 70 percent of its exports south. The leverage is not hard to identify.

Ottawa can call this a war if it wants. But when you sell seven out of every ten dollars' worth of goods to one customer, walking away from the table is a choice with a very short shelf life.