Tensions between the United States and Canada have rapidly escalated this week after Canadian Prime Minister Mark Carney delivered a rousing speech at the World Economic Forum in Davos, Switzerland, on Tuesday, declaring a "rupture" in the old world order and calling on "middle powers" to unite...

Tensions between the United States and Canada have rapidly escalated this week after Canadian Prime Minister Mark Carney delivered a rousing speech at the World Economic Forum in Davos, Switzerland, on Tuesday, declaring a "rupture" in the old world order and calling on "middle powers" to unite...