No. This has resulted in an organic, haphazard growth, with all the problems associated with it.
Population by itself is not an issue. Overcrowding and disorganized population growth without enough economic growth IS the issue. One of the areas most affected by this issue is the Valley of Mexico, where greater Mexico City is located.
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.
It seems there is a misunderstanding in your question. The population of Mexico City has never reached 7 billion; as of recent estimates, it is around 9 million within the city proper and about 21 million in the metropolitan area. The population growth of Mexico City has occurred over many decades, with significant increases in the 20th century. If you meant the growth from a different starting point, please clarify for a more accurate response.
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 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.