If all goes as expected, the U.S.-Mexico-Canada Agreement (USMCA), which is the renegotiated trade pact formerly known as NAFTA, will be officially signed by the three countries on 30 November. That is first day the U.S. can do so under its procedures and the last day Mexico’s outgoing President Pena Nieto can before President-Elect Lopez Obrador is inaugurated. The signing will trigger the start of the approval process in all three nations. Opposition has been muted in the U.S. prior to the elections as it isn’t a strong issue on which to challenge Trump. After all, he wasn’t the only one who wanted to renegotiate NAFTA; both Hillary Clinton and Barack Obama ran on that issue in 2008. The conventional political...