The sunset provision provides that the agreement expires sixteen years after it comes into force, unless certain conditions are met. The conditions begin with a «joint review» of the agreement after six years. During this review, governments can express their desire to continue the agreement. Canadian mining and oil companies can also count on ISDS provisions with Mexico in another agreement, the so-called comprehensive and progressive trans-Pacific Partnership agreement. After announcing that Canada had agreed on an agreement to help Mexico and the United States replace NAFTA, the 1994 trade agreement between the three nations, hated by Donald Trump, the Canadian dollar hit a five-month high against its U.S. counterpart. The Mexican peso is at a seven-week high. Exchange rates themselves are at the heart of the new pact. The OBJECTIVE of NAFTA was to remove barriers to trade and investment between the United States, Canada and Mexico. The implementation of NAFTA on January 1, 1994 resulted in the immediate removal of tariffs on more than half of Mexican exports to the United States and more than one-third of U.S. exports to Mexico.
Within 10 years of the implementation of the agreement, all U.S.-Mexico tariffs should be eliminated, with the exception of some U.S. agricultural exports to Mexico, which are expected to expire within 15 years.  Most of the trade between the United States and Canada was already duty-free. NAFTA also aimed to remove non-tariff barriers and protect intellectual property rights on marketed products. Since the first negotiations, agriculture has been a controversial topic within NAFTA, as has been the case with almost all free trade agreements signed under the WTO. Agriculture was the only party that was not subject to trilateral negotiation; Three separate agreements have been signed between the two parties. The Canada-U.S. agreement provided for significant tariff restrictions and quotas for agricultural products (mainly sugar, dairy products and poultry products), while the Mexico-U.S. pact allowed for broader liberalization within a time frame (this was the first North-South free trade agreement for agriculture to be signed). [Clarification needed] Now, you can imagine that in the first 6-year review, which will almost certainly take place after Trump is no longer in office, the three parties would review the agreement and make only one change: get out this sunset clause. Perhaps it will not be much in practice. Still, there is a bit of a risk.
A study published in the August 2008 edition of the American Journal of Agricultural Economics found that NAFTA increased U.S. agricultural exports to Mexico and Canada, although most of the increase occurred a decade after its ratification. The study focused on the impact of phase-in periods in regional trade agreements, including NAFTA, on trade flows. Most of the increase in membership agricultural trade, recently entered into the World Trade Organization, is due to very high trade barriers prior to NAFTA or other regional trade agreements.  The U.S. Chamber of Commerce attributed to nafta that U.S. trade in goods and services with Canada and Mexico increased from $337 billion in 1993 to $1.2 trillion in 2011, while the AFL-CIO signed the agreement for sending 700,000 U.S. production jobs to Mexico during that period.  While there is nothing wrong with updating agreements to monitor changes in the economy and correct the shortcomings found, this provision of the «revision» of the agreement goes a little too far. The possibility of automatic operation after only 16 years gives the whole company a degree of uncertainty.
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