Center for Economic and Policy Research: Mark Weisbrot, Stephan Lefebvre, and Joseph Sammut's "Did NAFTA Help Mexico? An Assessment After 20 Years"
Read this report. When NAFTA was first proposed in 1993, it set off a vigorous debate between its supporters and opponents over trade and investment policy between the United States and Mexico. Over twenty years after its enactment, economists, journalists, and policymakers began full-scale assessments of its impact. According to the report's authors, has NAFTA been a success, failure, or a combination of both?
Click http://web.archive.org/web/20160717134920/http://cepr.net/documents/nafta-20-years-2014-02.pdf link to open resource.