President Donald Trump's 25% tariffs on Canada and Mexico, and the doubling of 10% levies on goods from China, took effect Tuesday—and Beijing and Ottawa immediately hit back.

President Donald Trump’s long-threatened tariffs against Canada and Mexico have gone into effect, kicking off a trade war with America's neighbors.

U.S. forecast to enter recession after Trump crashes markets with tariffs on Canada, China and Mexico: Live - President’s ...