Clinton signed it on December 8, 1993. The agreement came into force on 1 January 1994.   At the signing ceremony, Clinton paid tribute to four people for their efforts to reach the historic trade agreement: Vice President Al Gore, Council of Economic Advisers Chair Laura Tyson, National Economic Council Director Robert Rubin and Republican Congressman David Dreier.  Clinton also said, “NAFTA means jobs. U.S. jobs and well-paying American jobs. If I didn`t believe it, I wouldn`t support this agreement.  NAFTA replaced the old Canada-U.S. free trade agreement. On January 29, 2020, President Donald Trump signed the agreement between the United States, Mexico-Canada. Canada has not yet adopted it in its parliamentary body until January 2020. Mexico was the first country to ratify the agreement in 2019.
If the Trans-Pacific Partnership of Origin (TPP) were to enter into force, existing agreements, such as NAFTA, would be reduced to provisions that do not conflict with the TPP or require greater trade liberalization than the TPP.  However, only Canada and Mexico would have the prospect of becoming members of the TPP after U.S. President Donald Trump withdrew the United States from the agreement in January 2017. In May 2017, the remaining 11 members of the TPP, including Canada and Mexico, agreed to pursue a revised version of the trade agreement without U.S. participation.  After the election of President Trump in 2016, support for NAFTA was highly polarized between Republicans and Democrats. Donald Trump has expressed a negative view of NAFTA, calling it “the worst trade deal ever adopted in this country.”  Republican support for NAFTA has grown from 43% in 2008 to 34% in 2017. Meanwhile, Democrats` support for NAFTA has grown from 41 percent in 2008 to 71 percent in 2017.  In 1984, Congress passed the Trade and Tariff Act, which gave the president quick power to negotiate free trade agreements. He only allowed Congress to approve or disapprove of Congress, and he could not change the negotiating points.
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.