On May 11, 2018, House Of Representatives spokesman Paul Ryan set May 17 as the deadline for congressional action. This deadline was not met and the agreement with Mexico was not reached until August 27, 2018.  At that time, Canada had not approved the agreement. Mexico`s outgoing President Enrique Pea Nieto, having left office on 1 December 2018 and requiring 60 days as a review period, the deadline for making the agreed text available was set at the end of September 2018, 30 September 2018. Negotiators worked around the clock and reached an agreement less than an hour before midnight on a draft text. The next day, October 1, 2018, the USMCA text was published as an agreed document. In 1994, the United States, Mexico and Canada, with the North American Free Trade Agreement (NAFTA), created the world`s largest free trade region, which generated economic growth and helped improve the living standards of the people of the three member countries. By strengthening trade and investment rules, this agreement has proven to be a solid foundation for building Canada`s prosperity and has provided a valuable example of the benefits of trade liberalization for the rest of the world. The new Canada-U.S.-Mexico agreement will strengthen Canada`s strong economic ties with the United States and Mexico. On December 19, 2019, the U.S.
House of Representatives passed the USMCA with multiparty support with 385 votes (Democracy 193, Republican 192) to 41 (Democracy 38, Republican 2, Independent 1).  On January 16, 2020, the U.S. Senate passed the trade agreement by 89 votes (Democrats 38, Republicans 51) to 10 (Democracy 8, Republican 1, Independent 1) and the bill was forwarded to the White House for the signature of Donald Trump.  On January 29, 2020, Trump signed the agreement (Public Law No: 116-113).  NAFTA has been formally amended, but not the 1989 Canada-U.S. Free Trade Agreement, which is only “suspended.”   The U.S.-Mexico-Canada agreement is based on the North American Free Trade Agreement (NAFTA), which originally came into force on January 1, 1994. The agreement under consideration was the result of more than a year of negotiations including possible U.S. tariffs on Canada, in addition to the possibility of separate bilateral agreements.  An April 2019 Analysis by the International Trade Commission on the likely effects of the USMCA estimated that if the agreement were fully implemented (six years after ratification), the agreement would increase U.S. real GDP by 0.35 percent and total U.S. employment by 0.12% (176,000 jobs).   The analysis cited by another Congressional Research Service study showed that the agreement would not have a measurable effect on employment, wages or overall economic growth.
 In the summer of 2019, Larry Kudlow, Trump`s chief economic adviser (the director of the National Economic Council at Trump White House), made unfounded statements about the likely economic impact of the agreement and overstated forecasts related to jobs and GDP growth.  The Trump administration`s office proposed the USMCA citing new digital trade measures, strengthening the protection of trade secrets and adapting the rules of origin of the automobile among the benefits of the trade agreement.  On March 1, 2019, many organizations representing the agricultural sector in the United States announced their support for the USMCA and asked Congress to ratify the agreement. They also called on the Trump administration to continue to support NAFTA until the new trade agreement is ratified.  On March 4, House Ways and Means President Richard Neal predicted a “very hard” path through Congress for the agreement.  Starting March 7, senior White House officials met with members of the Ways and Means House of Representatives, as well as moderate cackles from both parties, such as the Solver Caucus, the Tuesday Group and the Blue Dog Coalition, to seek ratification support.