Compared to what? With a population density of 6,000/sq km (15,000/sq mi), Mexico City has a bit less than the approximate density of San Francisco, California (6,800/sq km or 17,620/sq mi).
This means Mexico City is more crowded than most cities in the United States, but this is because urban sprawl has been -- thankfully -- minimized.
In general, the Central Mexican Plateau, where cities such as Queretaro, Guanajuato, Mexico City, Puebla or Toluca have been established. In particular, Mexico City is the most crowded and developed region throughout all Mexico.
Tenochtitilan no longer exists because when Cortez invaded, he burnt it to the ground. The Spanish soon built Mexico City on top of it. Mexico City is one of the most crowded cities today.
an area of a city that was poor, dangerous, and crowded
The poor crowded part of a city is often called the slums
You would not describe England as crowded, but its city centres are much like other city centres.
Pink's Hotdogs in universal city is never crowded
Tokyo, Japan is considered one of the most crowded cities in the world, with a high population density and bustling urban environment.
Pakistan is not a city, it is a country bordered by India.
Mexico City.
Mexico City
Mexico City, Mexico
Mexico City is in Mexico.