The most revealing strategic signal of the week emerged not from the acrimonious rhetoric of the transatlantic trade war, but from a carefully worded readout issued after Mark Carney spoke with Mexico’s president, Claudia Sheinbaum. The Canadian prime minister and his Mexican counterpart agreed to explore broadening their economic collaboration into critical minerals, clean technology, energy and advanced manufacturing, explicitly linking this push to the approaching review of the Canada–United States–Mexico Agreement. Viewed from Ottawa, the call confirmed that Carney intends to treat the USMCA’s mandatory re-examination not as a defensive scramble, but as an opportunity to redefine North American supply chains on terms more favourable to the continent’s two smaller partners.

From Mexico City, Sheinbaum’s engagement reflects a parallel calculus. Both leaders face an American administration that has weaponised trade interdependence; both understand that coordination, though delicate, multiplies their leverage. The communiqué’s phrasing—delivering “more certainty, security and prosperity” to their populations—was a diplomatic masterclass in addressing domestic anxieties without directly indicting Washington. Yet the subtext was unmistakable: Canada and Mexico are preparing to negotiate as a bloc on selected files when the USMCA review formally begins, and critical minerals, essential to the energy transition and defence supply chains, is the chosen beachhead.

This strategic coherence owes much to the political reconfiguration north of the 45th parallel. Carney’s election on 29 April 2025 was itself a product of the rupture initiated by Donald Trump’s trade aggression. The former Conservative leader Erin O’Toole, who served as party chief from 2020 to 2022, provided a telling endorsement this week, saying he would have refused an advisory role under Justin Trudeau but accepted under Carney precisely because the new prime minister’s approach is “straighter” and rooted in serious private-sector experience. Viewed from within Canada, this is not merely a partisan nicety. It suggests that Carney has succeeded, where Trudeau ultimately could not, in assembling a cross-partisan national consensus on the existential question of managing the relationship with Washington. Analysts in London note that Carney’s year-one performance has been described by Canadian observers as “sans-faute”—flawless—a record that contrasts sharply with Trudeau’s overpromising on the international stage.

The backdrop, of course, is a trade conflict that has spiralled into the farcical. The US commerce secretary, Howard Lutnick, this week described Canadian retaliation—including the widespread suspension of American alcohol sales by provinces—as “insulting” and “irrespectuous.” In Ottawa, the indignation was met with incredulity. To any observer spared the looking-glass logic of Washington’s trade hawks, the charge of disrespect from an administration that has spent a year denigrating its closest ally was simply the complaint of an arroseur arrosé.

Forward-looking, the critical minerals axis between Ottawa and Mexico City will test Carney’s central thesis: that technical competence and quiet coalition-building can tame the volatility of a neighbour governed by impulse. The USMCA review will place that proposition under immense strain. Yet Carney’s tenure, so far defined by action over slogans, suggests a leader comfortable with the long clock of institutional negotiation. Whether that patience can survive Washington’s permanent campaign mode remains the unanswered question.