[c_of_red]

Mexico doesn't have an army as we think of it. They use their troops as police, so they have little in the way of heavy weapons. It's not like they need an army to invade America and there is nothing else around for them to invade.
Venezuela is buying weapons as fast as they can be loaded on the ship. They use them to arm FRAC and other terrs, so it's not like they are going to be fighting another nation directly any time soon.
The Monroe Doctrine worked out pretty well, all things considered.