A 2007 study showed that nafta had “a significant impact on the volume of international trade, but a modest impact on prices and prosperity.”  In June 1990, Mexican President Carlos Salinas de Gortari called for a free trade agreement with the United States. In September 1990, Reagan`s successor, President George H.W. Bush, began negotiations with President Salinas for a liberalized trade agreement between Mexico, Canada and the United States. The Clinton administration negotiated an environmental agreement with Canada and Mexico, the North American Environmental Cooperation Agreement (NAAEC), which led to the creation of the Commission for Environmental Cooperation (CEC) in 1994. In order to allay concerns that nafta, the first regional trade agreement between a developing and two developed countries, would have negative effects on the environment, the Commission was tasked with carrying out an ex post-post environmental assessment it created one of the first ex-post frameworks for the environmental assessment of trade liberalization, which was to provide a certain amount of evidence regarding the initial assumptions concerning NAFTA and the environment. , such as the fear that NAFTA could create a “race to the bottom” of environmental regulation between the three countries or that NAFTA would put pressure on governments to strengthen their environmental protection.  The CEC organized four symposiums on assessing the impact of NAFTA on the environment and requested 47 contributions from leading independent experts on the subject.  The North American Free Trade Agreement (NAFTA), which came into force in 1994 and created a free trade area for Mexico, Canada and the United States, is the most important feature of bilateral trade relations between the United States and Mexico. On January 1, 2008, all tariffs and quotas for U.S. exports to Mexico and Canada were eliminated under the North American Free Trade Agreement (NAFTA).
The kick-off of a North American free trade area began with U.S. President Ronald Reagan, who made the idea part of his campaign by announcing his candidacy for president in November 1979.  Canada and the United States signed the Canada-U.S. Free Trade Agreement in 1988, and shortly thereafter, Mexican President Carlos Salinas de Gortari decided to address U.S. President George H.W. Bush to propose a similar agreement to make foreign investment after the Latin American debt crisis.  When the two leaders began negotiations, the Canadian government of Prime Minister Brian Mulroney feared that the benefits that Canada had gained through the Canada-U.S. free trade agreement would be undermined by a bilateral agreement between the United States and Mexico, and asked to be associated with the U.S.-Mexico talks.  NAFTA was the world`s largest free trade agreement when it was established on January 1, 1994.
NAFTA was the first time that two industrialized countries had signed a trade agreement with an emerging country. Although President Donald Trump warned Canada on September 1 that he would exclude them from a new trade deal if Canada did not comply with its demands, it is not clear that the Trump administration has the power to do so without congressional approval. :34-6 According to reports by the Congressional Research Service (CRS), one was published in 2017 and another on July 26, 2018, it is likely that President Trump would need congressional approval for fundamental changes to NAFTA before the changes are implemented. :34-6 The North American Free Trade Agreement (NAFTA) was implemented to promote trade between the United States, Canada and Mexico. The agreement, which removed most tariffs on trade between the three countries, came into force on 1 January 1994. Between 1 January 1994 and 1 January 2008, many tariffs – notably for agriculture, textiles and automobiles – were phased out.