NAFTA is an agreement that is in excess of 30,000 pages. Some of those pages cover issues of police activity giving Mexican and US police the right to co-police each other's territory for a certain distance on both sides of the border. What has that to do with trade? This isn't the only negative issue related to NAFTA.
These are sold as a free trade pacts. Tell me, what sounds like freedom that requires 30,000 pages to define what freedom is? Rather than freedom, these are the most restrictive forms of agreements every devised. And those restrictions go far afield of trade.
I also feel that these agreements are but a step on the road toward an AU. Open borders and other issues are certain to be a part of these agreements.