President Donald Trump is opening a new chapter in his playbook by invoking a tariff authority that no previous president has ever used, a move that could reshape future trade wars.Trump used a little-known provision of the 1930 Tariff Act to impose 50% tariffs on a range of Canadian goods.Known as Section 338, the nearly century-old law gives the president broad authority to impose duties on imports from countries deemed to discriminate against U.S. commerce. Its first-ever use by a U.S. president could establish a new legal blueprint for future trade disputes.Canada, one of America's top tra...
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