The Globe and Mail reports in its Wednesday edition that Donald Trump has fired the opening shots in a trade war that could do significant damage to Canadian businesses and consumers and reframe Canada-U.S. economic relations for the next four years. A triple-bylined item led by Mark Rendell said that on Monday, the president-elect threatened to put 25-per-cent tariffs on all imports from Canada and Mexico on his first day in office unless both countries deal with border security issues. The tariffs pose a huge risk to Canada's trade-oriented economy, which sends around 75 per cent of exports to the U.S. An across-the-board tariff would hit Canada's major exporting industries, including carmaking, oil and gas, mining and agriculture. It would also push up prices for Canadian consumers if Ottawa retaliates with its own tariffs. The North American auto sector is particularly integrated, with vehicles and components crossing borders several times before final assembly and delivery to a dealer's lot. About 55 per cent of vehicles sold in the United States in 2023 were assembled there, while 15 per cent came from Mexico and 7 or 8 per cent from Canada, according to Ward's Automotive and Bank of Montreal research.