It used to sound like a joke when President Donald Trump talked about making Canada the 51st US state, but to Canadian leaders it sounds like an increasingly serious threat and part of a plan.

Bringing Canada into the United States, however farcical the prospect may seem, would alter the political map in a way likely to cost Republicans. By Peter Baker Reporting from Washington As ...

Trump’s 51st state remarks sparked Canadian identity concerns, as many saw the mislabeling as a threat to sovereignty ...