Photo: freedomworks.org By THÉRÈSE MARGOLIS Mexico’s outgoing president, Enrique Peña Nieto, U.S. President Donald. J. Trump and Canadian Prime Minister Justin Trudeau signed the new United States-Mexico-Canada Agreement (USMCA) at a sidelines meeting during the two-day G-20 summit in Buenos Aires, Argentina, on Friday, Nov. 30. Notwithstanding, there is no guarantee that the USMCA will