In addition to the original NAFTA provisions, the USMCA borrows significant credits under the Trans-Pacific Partnership (TPP) trade agreements and the Comprehensive and Progressive Agreement for the Trans-Pacific Partnership (CPTPP). On April 3, 2020, Mexico announced its willingness to implement the agreement and joined Canada.  The agreement came into force on July 1, 2020.     The United States, Mexico and Canada have reached an agreement for the good of U.S. farmers, ranchers and agricultural enterprises. While agriculture has generally developed well under NAFTA, significant improvements to the agreement will allow food and agriculture to trade more equitably and increase exports of U.S. agricultural products. In 2008, Canadian exports to the United States and Mexico totaled $381.3 billion and imports $245.1 billion.  According to a 2004 paper by University of Toronto economist Daniel Trefler, NAFTA provided Canada with a significant net benefit in 2003, with long-term productivity increasing by up to 15 per cent in the sectors that experienced the largest tariff reductions.  While the decline in low-productivity jobs has reduced employment (up to 12 per cent of existing jobs), these job losses have lasted less than a decade; Overall, unemployment has declined in Canada since the legislation was passed. Trefler commented on the compromise, saying that the crucial trade policy issue was “how free trade can be implemented in an industrialized economy so that the long-term benefits and short-term adjustment costs borne by workers and others are recognized.”  The provisions of the Convention cover a wide range of agricultural products, from the homeless, industrial products, to working conditions and digital trade.
Among the most important aspects of the agreement are improving U.S. dairy farmers` access to the Canadian market, guidelines for a greater proportion of automobiles produced in the three countries and not imported from other countries, and maintaining the dispute settlement system, which is similar to that contained in NAFTA.   The United States had already concluded a free trade agreement with Canada in 1988, but the addition of a less developed country such as Mexico was unprecedented. Opponents of NAFTA have taken up wage differences with Mexico, which had only 30 percent of U.S. per capita income. U.S. presidential candidate Ross Perot said in 1992 that trade liberalization would cause a “huge noise” of American jobs fleeing the border. Supporters such as Presidents Bush and Clinton responded that the agreement would create hundreds of thousands of new jobs a year, while Mexican President Carlos Salinas de Gortari saw it as a chance to modernize Mexico`s economy so that it “exports goods, not people.” Many analysts explain these differences in results by the fact that the Mexican economy is “two-speed”, where NAFTA has led the growth of foreign investment, high-tech production and wage growth in the industrial north, while the south, largely agricultural, has remained disconnected from this new economy.