US President Donald Trump has announced he will impose 50-percent tariffs on Canadian steel and aluminium imports, escalating a trade war with the United States’s northern neighbour.

Sweeping tariffs on imports from Canada, Mexico and China went into effect just after midnight on Tuesday, raising U.S. tariffs to levels not seen in decades and rattling foreign governments and ...

As President Donald Trump’s global steel and aluminum tariffs took effect, the E.U. and Canada responded with their own levies, including on bourbon and motorcycles.