Nafta had little to no effect on trade nor did it improve mexicos situation in any significant why. But it did open up the posibility for companies to move jobs to mexico with no downside.

The articles didn't give enough power to federal government. While bad during their short life, the situation would have gotten worse over time with rebellions and possible war between states due to the national governments inability to stop it.

I agree with most of your argument, but i don't think that war is as close as you think. As insane as Kim is i think he likes being in power and he knows military action will result in a lose for him.