The formation of the valley, like the rest of the river basin, is of volcanic origin, reason for which the lava outcrops are common.

Although today the valley is deforested in its totality, exists information on an atmosphere of forests that in addition were rich in fauna. The climate, is considered, was warm humid.

Teotihuacan influences and participates in very important way in all the regions of Mesoamerica and at the same time incorporates important characteristics of its architecture; it is by that the teptihuacano style will extend, as it is observed later in Tula, Xochicalco, the Tajin, Cholula, Cacaxtla and Mexico-Tenochtitlan.

The religion that reigned in Teotihuacan era of politeista type, and their main Gods were Tlaloc and Quetzalcoatl. Tlaloc was the God of rain, according to the mexica culture, but in Teotihuacan, the possibility that exists it had had greater attributes. In some studies, it is speculated on that Tlaloc could have been not only one deity relate

The dominant estate lived within the ceremonial enclosure, since this one was a place sacred and restricted the other inhabitants. The city was divided in districts, which lodged to the rest of the population and were located around the great buildings. The constructions in which the teotihuacanos lived were done of marinates and wood, measured 150 m2 in average and were a species of apartments, in which they inhabited several families. Each district was constituted according to the office or to the ethnic origin of its inhabitants; as well as districts of craftsmen and farmers existed, also were them of Mayan and zapotecas, among others. At the time of height, Teotihuacan included/understood an area of 20 km2 and had a population between 150.000 and 200.000 inhabitants.

The third point, and without a doubt most significant, was in the question of the commerce. The teotihuacanos were much more that Ciudad-Estado, obtained a dominion on the near towns and in addition they penetrated, of well-known way, in zones very moved away, as it would be the case of the Mayan cities of Central America. One thought that the teotihuacanos had formed a coarse empire with military conquests, nevertheless, the most recent investigations explain that the inhabitants of Teotihuacan were pacific, dedicated in greater measurement to the commerce, which has made think to the specialists that the teotihuacano State could, through the commerce, introduce itself to recondite regions and thus to extend its cultural influence to other towns; although militaristas evidences exist and possible sacrifices, these belong to the final period of the large city.

Some common words found in the essay are:
Thalma Sullivan, Society La, Teotihuacan IV, Centroamerica Se, Cerro Gordo, Quetzalcoatl Tlaloc, IV Las, Central America, Teotihuacan Empire, Fat Hill, de la, la ciudad, de que, en los, en el, la poblacion, en la, con la, de la poblacion, de tipo, importante en, es la de, de mesoamerica la, acerca de la, de la ciudad,
Approximate Word count = 2631
Approximate Pages = 11 (250 words per page double spaced)