The United States imposed 50 per cent tariffs on US$20 billion worth of Canadian products early on Saturday and Canada immediately said it would retaliate, after last-ditch negotiations failed to resolve the latest strain in already tense relations between the historic allies. US President Donald Trump’s import taxes will hit about 5 per cent of what Canada ships to the United States every year, including products ranging from hockey sticks to tongue depressors. “Canada will match those tariffs...