The Agreement is the result of a 2017 – 2018 renegotiation of NAFTA by its member states , which informally agreed to the terms on September 30 , 2018 , and formally on October 1 . The USMCA was signed by United States President Donald Trump , Mexican President Enrique Peña Nieto , and Canadian Prime Minister Justin Trudeau on November 30 , 2018 as a side event of the 2018 G20 Summit in Buenos Aires . Each country 's legislature still must ratify the agreement
2018 G20 Summit
2018 G20 Buenos Aires summit
United States–Mexico–Canada Agreement