The president keeps insisting that the borderline between the U.S. and Canada is “artificial.” It’s worth asking why he’s fixated on this.

Canadian Prime Minister Mark Carney visited the White House on Tuesday for his first talks with Donald Trump and bluntly told the U.S. president that Canada would never be for sale.

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,