Donald Trump keeps insisting that the borderline between the U.S. and Canada is "artificial." It's worth asking why he's become fixated on this.

New Canadian Prime Minister Mark Carney has asked President Donald Trump not to call Canada the 51st state of the United States as he did under Carney’s predecessor, Justin Trudeau. During a press conference on the roof of the Canadian Embassy on Pennsylvania Avenue,

There were high expectations, much tension, and maximum pressure, especially after Trump launched an inexplicable campaign in November advocating for the annexation of Canada, a delirious project to turn a sovereign,