Trump imposes 50% tariff on Canadian exports after auto trade talks collapse. Canada retaliates with dollar-for-dollar duties on US steel and

Canadian Prime Minister Mark Carney vows to retaliate, says his country recognized that 'America has changed' and that the two countries would 'not return to our old relationship'

The United States imposed 50% tariffs on about $20 billion worth of Canadian goods Saturday after days of negotiations between the two longtime allies...