You don't need to go that far, you don't even have to cross the border to see what it's beginning to look like. You can go to almost any border county --at least in Texas-- and find the neighborhoods with outhouses and open latrines being built or drive through one of the many government housing projects and see windows made of cardboard and garbage everywhere. Or schools with kids exposing the others to TB and hepatitis. More and more there's less difference between the US and Mexican side.
Look, you're right on target. This is a sad commentary. It's just amazing the two faced treatment this gets. Imagine some farmer on the border allowing the inlaws to set up shop on the back 40 in this manner. The flies wouldn't have found the latrine before the locals would have put an end to it. But now it's just honkey-dorey!