The tariffs arrived as they had repeatedly threatened to. Around 22 August 2026, the United States imposed 50% duties on approximately $20 billion worth of specific Canadian goods, a list ranging from honey to hockey sticks, after last-ditch negotiations between Washington and Ottawa collapsed. Canadian Prime Minister Mark Carney quickly promised to match them. It was the latest, and sharpest, escalation in a conflict that had been building since late 2024.
The dispute has its origins in a post on Truth Social. On 25 November 2024, President Donald Trump announced plans to impose 25% tariffs on all Canadian and Mexican imports, citing what he described as the two countries' failure to stop fentanyl trafficking and illegal border crossings. ABC News recorded the announcement as the opening move in what would become a prolonged multi-front conflict.
The backdrop was a closely integrated trading relationship. The Canada-United States-Mexico Agreement (CUSMA), known in the United States as the United States-Mexico-Canada Agreement (USMCA), had governed cross-border trade between the three countries. That framework would come under sustained pressure throughout 2025 and 2026.
The first tariffs take hold, and Canada hits back
Trump signed an executive order on 1 February 2025, invoking the International Emergency Economic Powers Act (IEEPA), a law granting presidents broad powers to regulate trade during declared national emergencies. The order imposed 25% tariffs on most Canadian goods and a reduced 10% rate on Canadian energy, effective 4 February, according to CTV News.
A brief pause followed. On 3 February 2025, Trump agreed to hold the tariffs for 30 days after Canada made commitments on border security and drug trafficking, AP reported. The pause expired without a lasting agreement, and the tariffs took effect on 4 March 2025.
Canada responded with force. Then-Prime Minister Justin Trudeau announced countermeasures covering more than $100 billion worth of American goods, to be introduced within 21 days, AP reported.
The conflict widened further on 12 March 2025, when the U.S. imposed 25% tariffs on all steel and aluminum imports globally, including those from Canada. Canada responded with tariffs on approximately $20.7 billion in U.S. goods, ABC News noted.
Trade talks came close to rupturing entirely in late June. Steel and aluminum duties had already been raised from 25% to 50% on 2 June 2025, ABC News reported. Trump then suspended negotiations on 27 June 2025 after Canada announced a planned Digital Services Tax on U.S. technology firms. Talks resumed two days later, on 29 June, after Canada withdrew the tax, ABC News reported.
On 31 July 2025, with no finalised deal by a 21 July deadline, Trump raised tariffs on Canada from 25% to 35%, CTV News reported.
Courts challenge the legal basis, and the trade agreement frays
The legal foundation for the tariffs came under serious challenge in the courts. In May 2025, the U.S. Court of International Trade struck down Trump's broad-based IEEPA tariffs, ruling he lacked the authority to impose them. The decision blocked both the so-called Liberation Day duties and the fentanyl-related tariffs on Canada, CTV News reported.
The administration appealed, but in February 2026 the U.S. Supreme Court ruled definitively that Trump had acted outside his legal authority in using IEEPA for the Liberation Day tariffs and the fentanyl-related duties on Canada, Mexico, and China, according to Wikipedia's documented timeline. The administration subsequently pivoted to different legal instruments to sustain and expand tariff pressure.
On 1 July 2026, U.S. Trade Representative Jamieson Greer announced that the United States would not renew CUSMA in its current form. The agreement remained formally in place, but the announcement signalled a fundamental shift in Washington's posture toward the trading architecture that had underpinned the bilateral relationship for years, CTV News reported.
A targeted escalation, a failed deal, and tariffs that took hold
On 20 July 2026, Trump announced a further escalation: 50% tariffs on approximately $20 billion worth of specific Canadian goods, with no exemption for CUSMA-compliant products. The tariffs were set to take effect within 30 days, CTV News reported.
On 19 August 2026, Trump announced a three-day delay, claiming a last-minute deal had been reached. Canada confirmed "substantial progress" but said important work remained, NPR reported. The reprieve did not hold. Negotiations broke down before the extended deadline, and the 50% tariffs took effect around 22 August 2026. Prime Minister Carney said Canada would match them, the Economic Times reported.
Several questions remain unanswered. The precise legal mechanism Trump used for the July 2026 sector-specific tariffs has not been publicly confirmed, and its vulnerability to court challenge is unclear. The full details of the arrangement announced on 19 August, and why it fell apart, are also unknown. Whether CUSMA will be formally terminated or renegotiated, and on what timeline, remains an open question.
What the record does show is the arc of escalation: a social media post threatening 25% tariffs has given way, through executive orders, court battles, retaliatory measures, and failed negotiations, to 50% duties on a targeted range of Canadian products, with both governments now committed to matching the other's next move.
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