Never. Some areas sink by a few inches a year due to aquifer depletion, but it doesn't mean the city is caving in; the most "dramatic" result of such sinking are some areas of the city with uneven older buildings or roads with ridges and valleys felt when traveling over them.
Mexico City
Mexico is ground zero, all the roads start and finish in Mexico City, so all the roads stated from Mexico City, since Mexico City is the capital of capitals, as one of its names it has always been an imperial city, so that is why all the roads lead to Mexico City.
use the explorer kit
I'm not entirely sure where you're going. If you're heading to a New Mexico City, say Albuquerque, it's about 870 miles. If you're off to Mexico City, Mexico, it's just under a thousand.
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.
Ruins of the ancient city of Tenochtitlan, capital of the Aztec empire.
the aztec city is now under present day mexico city
I'm not entirely sure where you're going. If you're heading to a New Mexico city, say Albuquerque, it's about 870 miles. If you're off to Mexico City, Mexico, it's just under a thousand.
lavender and go west
Some of it comes from the Colorado River and some of it is ground water.
the under ground city that has not yet been discovered
Yes. After Spanish conquistadors conquered Tenochtitlan in 1521, they razed the city and built atop the ruins what is known today as Mexico City.