It didn't. Its just that many people have found the house market too expensive to live there. That is one of the reasons many people live on the periphery of Mexico City.
Mexico city
Mexico City is the largest city in North America by population.
Mexico City (population: 21,163,226)
Mexico City, with a population of 19,231,829.
mexico city
the estimated population of mexico city for 2011 is 8,857,188
Los Angeles has a population of 15.25 million while Mexico City has a population of 21.16 million. Mexico City is the largest of both.
Moscow has a population of 10,524,400. New York City has a population of 8,363,710. The State of New Mexico has a population of 1,819,045.
Yes, Mexico City is a primate city (its the capital of Mexico and it has more than twice the population of Mexico's second largest city, Guadalajara).
Mexico City
Mexico City is the third largest in the world, with a population of 20.45 million inhabitants. São Paulo has a population of 19.89 million inhabitants. Mexico City is the largest city in the Americas.
That would be Mexico City. Population: 19,231,829