Most of the new duties kicked in Thursday, hitting countries with elevated rates that mark a departure from long-standing trade norms.

President Donald Trump just enacted a new wave of tariffs on dozens of America’s trading partners, marking a substantial escalation in ongoing trade tensions that could constitute the biggest change to the global economy in nearly a century.

President Donald Trump said the US will put a 35% tariff on some imports from Canada, escalating the tensions between two countries that have impaired one of the world’s largest trading relationships.