the main goal of nafta was to help mexico not the U.S. and Canada.
When negotiations for NAFTA began in 1991, the goal for all three countries was the integration of Mexico with the highly developed, high-wage economies of the United States and Canada. The hope was that freer trade would bring stronger and steadier economic growth to Mexico, providing new jobs and opportunities for its growing workforce and discouraging illegal migration from Mexico. For the United States and Canada, Mexico was seen both as a promising new market for exports and as a lower cost investment location that could enhance the competitiveness of U.S. and Canadian companies. http://www.cfr.org/trade/naftas-economic-impact/p15790
but this is the one that needs to be looked at
The Mexican and U.S. Economies after Twenty Years of
NAFTA
http://fs2.american.edu/blecker/www/research/...A_2014.pdf
When negotiations for NAFTA began in 1991, the goal for all three countries was the integration of Mexico with the highly developed, high-wage economies of the United States and Canada. The hope was that freer trade would bring stronger and steadier economic growth to Mexico, providing new jobs and opportunities for its growing workforce and discouraging illegal migration from Mexico. For the United States and Canada, Mexico was seen both as a promising new market for exports and as a lower cost investment location that could enhance the competitiveness of U.S. and Canadian companies. http://www.cfr.org/trade/naftas-economic-impact/p15790
but this is the one that needs to be looked at
The Mexican and U.S. Economies after Twenty Years of
NAFTA
http://fs2.american.edu/blecker/www/research/...A_2014.pdf