The goal of NAFTA was to eliminate barriers of trade and investment between the USA, Canada and Mexico. The implementation of NAFTA on January 1, 1994, brought the immediate elimination of tariffs on more than one half of U.S. imports from Mexico and more than one third of U.S. exports to Mexico. Within 10 years of the implementation of the agreement, all US-Mexico tariffs would be eliminated except for some U.S. agricultural exports to Mexico that were to be phased out in 15 years. Most US-Canada trade was already duty free. NAFTA also seeks to eliminate non-tariff trade barriers.
According to the Department of Homeland Security Yearbook of Immigration Statistics, during fiscal year 2006 (i.e., October 2005 through September 2006), 73,880 foreign professionals (64,633 Canadians and 9,247 Mexicans) were admitted into the United States for temporary employment under NAFTA (i.e., in the TN status). Additionally, 17,321 of their family members (13,136 Canadians, 2,904 Mexicans, as well as a number of third-country nationals married to Canadians and Mexicans) entered the U.S. in the treaty national's dependent (TD) status. Because DHS counts the number of the new I-94 arrival records filled at the border, and the TN-1 admission is valid for three years, the number of non-immigrants in TN status present in the U.S. at the end of the fiscal year is approximately equal to the number of admissions during the year. (A discrepancy may be caused by some TN entrants leaving the country or changing status before their three-year admission period has expired, while other immigrants admitted earlier may change their status to TN or TD, or extend TN status granted earlier). Canadian authorities estimated that, as of December 1, 2006, a total of 24,830 U.S. citizens and 15,219 Mexican citizens were present in Canada as "foreign workers". These numbers include both entrants under the NAFTA agreement and those who have entered under other provisions of the Canadian immigration law. New entries of foreign workers in 2006 were 16,841 (U.S. citizens) and 13,933 (Mexicans). Criticism and controversies