The United States is reviving trade tensions with its major economic partners. Donald Trump has just announced massive new tariffs on imports from Canada, Mexico, and China, and is reigniting an aggressive protectionist policy. Presented as a response to the fight against fentanyl trafficking and illegal immigration, this decision primarily fits into a broader strategy aimed at renegotiating North American trade agreements and protecting the American industry from Chinese competition. This escalation has immediately provoked a virulent reaction from the targeted countries, which are already preparing retaliatory measures, foreshadowing a new economic showdown with uncertain consequences.