The basic facts concerning Mexico's growth in the post-NAFTA period are straightforward. Its growth has been extremely weak in this decade by any measure. While NAFTA may not be the cause of Mexico's weak growth, it is very hard to make the case that Mexico's aggregate economic performance would have been even worse without NAFTA. The World Bank analysis applies flawed econometric analysis that appears to make this case. When the flaws are corrected (or when the results are read more carefully), it turns out that in no version does the study show that NAFTA led to more rapid GDP growth in Mexico. While there are other bases for assessing the benefits and costs of NAFTA, the World Bank's analysis does not provide a basis for supporting claims that NAFTA increased growth in Mexico.
By 2016, the World Bank's regression results imply that NAFTA will have lowered Mexico's per capita GDP by 4.3 percent.-Center for Economic Policy Research
Mexico's growth was strong only when Keynesian economics was broadly accepted. No surprise there.
Brazil, Argentina, and every other South American country has already REJECTED a CAFTA-like deal. 3 out of the 6 countries supposedly covered in CAFTA have not even accepted it yet. With the record we have of NAFTA's dismal failure, it's no surprise either.