Canada announces dollar-for-dollar retaliatory tariffs on US goods starting September 8 after trade talks collapse and US imposes 50% tariffs on

Negotiations between the U.S. and Canada broke down late Friday and tariffs went into effect early Saturday morning.

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'