Trump's 50% tariffs on Canadian goods take effect, sparking retaliation

U.S. President Donald Trump's 50% tariffs on Canadian goods took effect Saturday, impacting roughly $20 billion in imports. Canada promised "dollar for dollar" retaliation starting Sept. 8, with no further talks scheduled. The levies cover products from hockey sticks to agricultural goods, including items previously protected under the USMCA trade pact. Trump invoked Section 338 of the Tariff Act of 1930, a never-before-used provision requiring no investigation, potentially facing legal challenges. Experts warn the escalating trade war will raise consumer prices and create economic uncertainty. The tariffs add to existing levies, marking a significant shift in North American trade relations and risking political consequences for Trump in a midterm election year.