Trump has repeatedly called Canada the “51st state.” “It’s very offensive, because we’re the United States ... way that the ...

The American president recently started fixating on the line separating the United States and Canada. It’s worth asking why.

But Mr. Trump’s criticisms have upended the business-as-usual atmosphere at the border. Map along the Canada-United States border highlighting Coutts, Canada and Sweet Grass, United states.

Canadians and Republicans alike are confounded as President Donald Trump increasingly links a trade war to his push to annex America's northern neighbor.