The word Teotihuacán comes from Náhuatl language and means "place where men become gods" or "City of Gods". This name was given by the Aztecs, but the real name given by their inhabitants is still unknown. It was one of the largest pre-Hispanic cities of Mesoamerica. The area of archaeological monuments was declared a "World Heritage Site" by UNESCO in 1987.
Teotihuacan's origins are still under investigation. Around the beginning of our era, it was a village that began to gain importance as a center of worship in the valley of Anáhuac*. The first major buildings are from this time, as shown by the excavations at the Pyramid of the Moon. The heyday of the city took place during the Classic Period (III-VII century B.C). At that time, the city was an important commercial and political node which once had an area of about 21 km2, with a population of 100,000 to 200,000 inhabitants. Teotihuacán's influence was felt by all directions of Mesoamerica, as shown by the findings in cities such as Tikal, and Monte Alban, among others.
The decline of the city occurred in the seventh century, in a context marked by political instability, internal rebellions and climatic changes that caused a collapse in Northern Mesoamerica. Most of the city's population was dispersed by various locations in the Valley of Mexico. *Name which is called the actual "Valley of Mexico", Capital of the Country