The Frame The headlines are currently obsessed with the mechanics of the 50% tariff: the invocation of Section 338 of the Tariff Act of 1930, the potential for legal challenges in US courts, and the immediate volatility in the CAD/USD exchange rate. To the market participant, this looks like a standard, albeit aggressive, escalation in a bilateral trade dispute. But viewing this through the lens of trade law alone is a category error. We are not witnessing a disagreement over market access; we are witnessing the controlled demolition of the post-war liberal order’s most fundamental assumption: that trade is a stabilizer of peace. When President Trump targets Canada—a partner previously insulated by the USMCA framework—he is signaling that the era of ‘rules-based’ institutionalism has been replaced by a regime of pure, unadulterated friction. This is not about protecting American industry; it is about the rebranding of sovereignty as a tool of...