I think there are too many people in
Mexico City not too many in the Country of Mexico
Mexico City the largest city in the world with 21 million people, has 50% unemployment and the worlds worst air pollution. It's so bad, they are doing case studies because the population is losing the ability to smell.
At least they'll get their legal green to make it all bearable
GAIA Case Study: Mexico Urban air pollution in Mexico City
Video: Air Pollution Means Mexico City Residents Losing Sense of Smell | EarthTrends