The midnight Sunday deal between U.S. and Canadian negotiators was a decisive victory for President Trump’s unconventional approach to trade. Even the administration’s fiercest critics are calling the revisions significant. For the first time, Mr. Trump and his allies can point to significant progress toward his core campaign promise of renegotiating trade deals to the benefit of the U.S. workers.
The U.S.-Mexico-Canada Agreement requires that cars be made with 75% North American components to escape tariffs. Forty percent...