President Trump says his new trade deal with Mexico can go forward without Canada, but that’s more bluster than reality. Canada needs the U.S. market for its goods, but Mr. Trump also needs Canada to join his revised deal to prevent economic harm and get his pact through Congress.
Start with the economic interdependence, which is considerable. Canada rankedas the number one export market for no fewer than 33 U.S. states in 2016. That includes northern states that border Canada, but also Georgia, Alabama, Pennsylvania, Iowa...