A conquistador named Hernan Cortes.
One thing that led to the decline of the Aztec Empire was the shortage of skilled farmers. Mistreating the people they conquered. Additionally, the Spanish Conquistadors ripped the empire apart, destroyed the Aztec Army, killed Moctezuma (the Aztec Leader), and colonized the entire region.
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The Smallpox and European Conquistadors
Hernán Cortés led the conquest of the Aztec.
Muslims conquered other areas in Africa and cut off Axum from its lucrative trade routes.
Mistreatment of conquered peoples by the aztec.
Exposion to European diseases.
The lack of money led to their decline.
there was floods,drought...etc.
One of the larger factors that lead to the decline of the Aztec and Inca civilizations are people from Europe bringing disease and taking advantage of these people.
The Aztecs had a lot of enemies and when the Spanish conquistadors arrived to Mexico the Aztec enemies were more than happy to help the Spanish destroy the Aztecs.
The decline of the Mayan and Olmec civilizations was primarily due to internal factors such as environmental degradation, social strife, and political fragmentation, leading to a gradual decline over centuries. In contrast, the Aztec and Inca civilizations faced rapid collapse largely due to external pressures, notably Spanish conquest and the introduction of diseases like smallpox, which decimated their populations. While the Maya and Olmec experienced a slow decline, the Aztec and Inca civilizations faced abrupt and violent disruption that led to their swift downfall. Thus, the nature of their declines differed significantly in pace and causes.