As far as invading Mexico and taking over.... why? Think about it. Why would we want a country where you can't even drink the water? It's a shithole. There is fuck all for us to get to justify the cost of seizing it and maintaining it. So just let the cockroaches have it.
PV is ok as far as Mexico goes if you have to visit. I haven't been in years. It was the only place I could go and know that I could find my favorite tequila in stock every single time and not pay over $300 for a bottle. The city was heavily marketed to the American tourist. But unlike the more expensive Americanized city Cancun or the more isolated Cozumel (which is like a more expansive version of Key West for those who know), it is more budget friendly and still retains a vibe of authentic Mexican culture. The pharmacies there have these big banner ads they put out front that would have Ronnie or Heath on them with their Mr. O trophy and STEROIDS SOLD INSIDE - WE SHIP on the bottom. I remember one owner nonchalantly explaining his shipping scam to me and how he ripped people off. He didn't give a fuck if I knew. It was like "meh".