The theme of the end still confuses people with their scheme of one hypothesis, which is not compatible with the others. None of them gives us an unquestionable answer. It is true that the traces of huge fires have been found but it is not easy to date and interpret them. Many of these fires appear to have been methodically prepared. Many archaeologists attribute the invasion and destruction of Teotihuacan to nomadic warrior tribes of the North. We know that the city was not fortified and has never been assured that it possessed a true army. On the other hand, supporters of the hypothesis of the Teotihuacán invasion and drought date these events towards the beginning of the seventh century even earlier, around the year 500, this time is usually considered the summit of Teotihuacán.
However, most specialists do not diagnose the signs of decay and weariness of the Teotihuacan civilization before the seventh century. This date could raise a new aristocratic caste that would be a rival for the priests, would have formed its own theocratic norms and would be practiced with ambition of power and personal enrichment, a kind of government that if it was not authoritarian, at least would be oppressive and more strict , Which would provoke over a long period of time, a disorganized and unbalanced civilization. The rivalries and struggles within the priestly class, an overpopulation increasingly difficult to feed; Hunger, bad harvests, including a possible climatic alteration that would damage the agriculture that helped to the separation of the town from the City of the Gods: all this chain of causes and effects could originate the disintegration of the glorious metropolis.
This and other conjectures expect our incomplete knowledge and understanding of the remote past Pre-Columbian, someday progress. Only one thing seems certain, at the beginning of the eighth century, Teotihuacan, partially destroyed, deprived of its sacerdotal elite and religious substance, abandoned by the majority of its inhabitants, survived with an obscure existence. The capital of the Fifth Sun had concluded its splendid course and had begun its descent into the dark night, future of all greatness. For the twentieth century of the Christian era, the purest focus of the civilization of ancient Mexico remains a fascinating open quarry on the flank of history.