Extinction of the Aztec Civilization

Tenochtitlán was the capital of the Aztec civilization. The reasons why this civilization disappeared still remain a mystery but there are a number of factors that may explain it.

1 - The act of colonizing a virgin country, through a particular religion, is always an act of extreme violence that always leads to rejection of the local population. The colonized are always the oppressed and the oppressors are the settlers.

2 - Diseases brought by Spanish explorers and bad hygiene habits and vices that local people do not know.

3 - Droughts caused by climate change.

4 - A mix of the two previous reasons.

The intense production of sunspots on the Sun which caused long periods of drought, which in turn emptied the fields and led to the hunger of people. The study of rings of certain trees is closely related to the maximum of sunspots. The science of cutting trees is the "dendrology". The production of more solar heat generates changes. Many ancient civilizations had the sun as God and may not know this phenomenon. And when they gave periods of drought the population understood the phenomenon as a punishment of their Sun God. Hence the human sacrifices in an attempt to appease the Sun God.

During the period of discovery the most common form of transport diseases (involuntarily) to other continents was by rats traveling in boats. These were the most effective way to carry the virus. But the sailors themselves carried in their bodys new diseases to these continents.
In the new continents certain viruses did not exist and immune systems of the local population was not prepared to react to these new virological agents.
The colonists themselves were living with the virus without being affected. They had an immunological structure richer and diverse. In other words, the settlers had a library of DNA registration and wider as the locals had never dealt with the situation.

The combination of these two factors: drought and transport of unknown viruses in the new continents led to a plague that decimated the local population.

This explains the fall of a civilization that was advanced for its time, it dominated astronomy and mathematics, in addition to its rich culture that display an aesthetic language. A civilization that can exceed the level of survival, grow and express themselves culturally through records in the architecture it is always considered as advanced in relation to others.

5 - However there is another factor that was crucial and was not reported yet. Some ancient civilizations had a weakness that led to its extinction. It was the fact that they are isolated. When some disaster happened could not turn to outside help or look for another place to move because their horizon was limited. The civilizations that dominated the sea and expanded their horizon always had more advantage over others who had never seen the rest of the world beyond its site. These were doomed to failure because they are frozen in space.

Other more subtle forms of extinction of civilizations, not the case, it is by confrontation techniques of language and mathematics. Some systems of mathematical knowledge or written language are more effective and simpler than others. And those who remain in the more obsolete tend to be overcome.

It's the clash of cultures that leads to the development and progress of humanity but also the extinguishment of certain civilizations.