A good discussion. An apt analogy with the US as "giant" Gulliver. Excellent points about American blindness to the dangers inherent in creating a failed state on its southern border, the great advantages of having cooperation from its northern neighbour, and that even mighty giants can fall. 

Ah, the poor victimized USA, more sinned-against than sinning, with no misfortunes ever its own fault, nevertheless remains the most powerful nation on the face of the planet, and wants to become even more so by playing a risky game of Beggar-Thy-Neighbour.  The wise will take heed of the ulterior meaning in "America first."