Following diplomatic negotiations dating back to 1986 among the three nations, the leaders met in San Antonio, Texas, on December 17, 1992, to sign NAFTA. U.S. President George H. W. Bush, Canadian Prime Minister Brian Mulroney and Mexican President Carlos Salinas, each responsible for spearheading and promoting the agreement, ceremonially signed it. The signed agreement then needed to be authorized by each nation's legislative or parliamentary branch.

Before the negotiations were finalized, Bill Clinton came into office in the U.S. and Kim Campbell in Canada, and before the agreement became law, Jean Chrétien had taken office in Canada.

The proposed Canada-U.S. trade agreement had been very controversial and divisive in Canada, and the 1988 Canadian election was fought almost exclusively on that issue. In that election, more Canadians voted for anti-free trade parties (the Liberals and the New Democrats) but the split caused more seats in parliament to be won by the pro-free trade Progressive Conservatives (PCs). Mulroney and the PCs had a parliamentary majority and were easily able to pass the 1987 Canada-US FTA and NAFTA bills. However, he was replaced as Conservative leader and prime minister by Kim Campbell. Campbell led the PC party into the 1993 election where they were decimated by the Liberal Party under Jean Chrétien, who had campaigned on a promise to renegotiate or abrogate NAFTA; however, Chrétien subsequently negotiated two supplemental agreements with the new US president. In the US, Bush, who had worked to "fast track" the signing prior to the end of his term, ran out of time and had to pass the required ratification and signing into law to incoming president Bill Clinton. Prior to sending it to the United States Senate Clinton added two side agreements, The North American Agreement on Labor Cooperation (NAALC) and the North American Agreement on Environmental Cooperation (NAAEC), to protect workers and the environment, plus allay the concerns of many House members. It also required US partners to adhere to environmental practices and regulations similar to its own.

With much consideration and emotional discussion, the House of Representatives approved NAFTA on November 17, 1993, 234-200. The agreement's supporters included 132 Republicans and 102 Democrats. NAFTA passed the Senate 61-38. Senate supporters were 34 Republicans and 27 Democrats. Clinton signed it into law on December 8, 1993; it went into effect on January 1, 1994.[3][4] Clinton, while signing the NAFTA bill, stated that "NAFTA means jobs. American jobs, and good-paying American jobs. If I didn't believe that, I wouldn't support this agreement."[5]
[icon] This section requires expansion. (December 2009) Remarks on the Signing of NAFTA (December 8, 1993)
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Bill Clinton's remarks on the signing of the North American Free Trade Agreement, December 8, 1993.
Remarks on the Signing of NAFTA (December 8, 1993)
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Provisions

The goal of NAFTA was to eliminate barriers to trade and investment between the U.S., Canada and Mexico. The implementation of NAFTA on January 1, 1994 brought the immediate elimination of tariffs on more than one-half of Mexico's exports to the U.S. 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 would be eliminated except for some U.S. agricultural exports to Mexico that were to be phased out within 15 years. Most U.S.-Canada trade was already duty-free. NAFTA also seeks to eliminate non-tariff trade barriers and to protect the intellectual property right of the products.

Chapter 52 provides a procedure for the interstate resolution of disputes over the application and interpretation of NAFTA. It was modeled after Chapter 69 of the Canada-United States Free Trade Agreement.[6] The roster of NAFTA adjudicators includes many retired judges, such as Alice Desjardins, John Maxwell Evans, Constance Hunt, John Richard, Arlin M. Adams, Susan Getzendanner, George C. Pratt, Charles B. Renfrew and Sandra Day O'Connor.
Intellectual Property

North American Free Trade Agreement Implementation Act made some changes to the Copyright law of the United States, foreshadowing the Uruguay Round Agreements Act of 1994 by restoring copyright (within NAFTA) on certain motion pictures which had entered the public domain.[7]
Environment

Securing U.S. congressional approval for NAFTA would have been impossible without addressing public concerns about NAFTA’s environmental impact. The Clinton administration negotiated a side agreement on the environment with Canada and Mexico, the North American Agreement on Environmental Cooperation (NAAEC), which led to the creation of the Commission for Environmental Cooperation (CEC) in 1994. To alleviate concerns that NAFTA, the first regional trade agreement between a developing country and two developed countries, would have negative environmental impacts, the CEC was given a mandate to conduct ongoing ex post environmental assessment of NAFTA.[8]

In response to this mandate, the CEC created a framework for conducting environmental analysis of NAFTA, one of the first ex post frameworks for the environmental assessment of trade liberalization. The framework was designed to produce a focused and systematic body of evidence with respect to the initial hypotheses about NAFTA and the environment, such as the concern that NAFTA would create a "race to the bottom" in environmental regulation among the three countries, or the hope that NAFTA would pressure governments to increase their environmental protection mechanisms.[9] The CEC has held four symposia using this framework to evaluate the environmental impacts of NAFTA and has commissioned 47 papers on this subject. In keeping with the CEC’s overall strategy of transparency and public involvement, the CEC commissioned these papers from leading independent experts.[10]