As expected, the USMCA was signed by all three sides at the G20 summit in Buenos Aires on November 30, 2018.   Disputes over labour rights, steel and aluminum prevented the ratification of this version of the agreement.   On December 10, 2019, Canada`s Deputy Prime Minister Chrystia Freeland, U.S. Trade Representative Robert Lightizer, and Mexican Under Secretary of State for North America Jesus Seade formally signed a revised agreement, ratified by all three countries on March 13, 2020. In the chapter “Sanitary and Phytosanitary Measures” (SPS), the United States, Mexico and Canada agreed to strengthen disciplines on science-based spS measures, while ensuring that the Parties respect their sovereign right to the protection of human, animal and plant life or health. Provisions include improving transparency in the development and implementation of SPS actions; promoting science-based decision-making; improve certification, regionalization and equivalence processes; conducting system-based audits; improve the transparency of import controls; and cooperate to improve the compatibility of measures. The new agreement would establish a new technical consultation mechanism to resolve issues between the parties. The North American Free Trade Agreement (NAFTA), signed by Prime Minister Brian Mulroney, Mexican President Carlos Salinas and U.S. President George H.W.
Bush, entered into force on January 1, 1994. NAFTA has created economic growth and a rising standard of living for the citizens of the three member states. By strengthening trade and investment rules and procedures across the continent, NAFTA has proven to be a solid foundation for building Canada`s prosperity. NAFTA replaced Canada-U.S. Free Trade Agreement (CUFTA). Negotiations on CUFTA began in 1986 and the agreement entered into force on 1 January 1989. The two nations agreed on a historic agreement that put Canada and the United States at the forefront of trade liberalization. For more information, visit the Canada-U.S. Free Trade Agreement information page.
During the 2016 US presidential election, Donald Trump`s campaign included a promise to renegotiate or cancel NAFTA if the renegotiations failed.  After his election, Trump made a number of changes that affect trade relations with other countries. .