Question

What factors led to the fall of the Aztec civilization?
In 1519, Spanish explorer Hernando Cortes arrived on the Gulf Coast of Mexico. Cortes had heard great stories about the Aztec people. In the two years before the arrival of Cortes, natural disasters, a flood, an earthquake, and a comet had warned the Aztec ruler, Moctezuma II, that his rule was about to end. When Cortes arrived with 500 men, the Aztec people thought that he was a light-skinned god named Quetzalcoatl. They began to worship him. But soon they realized that Cortes was not a god. Cortes got the neighboring tribes who hated the Aztecs to fight with him. Fighting together, they overthrew the Aztec nation. Maybe if the Aztecs had been better neighbors they could have beaten the Spanish soldiers? The Spaniards also brought diseases, such as smallpox, with them to the Americas. It did not take long before 70 percent of the population died of illness. The Aztec people knew about the wheel. They had used it to make their calendar and they used it in their toys. But they did not have any horses or other beasts to pull wagons. The Spaniards were able to use their wheels to pull carts loaded with food and weapons into the Aztec region. In this way, they were able to defeat the Aztec people. They were able to travel great distances with needed supplies. A mass killing of Aztec people at the hands of the Spaniards took place. This destructive behavior almost wiped out the entire Aztec population.
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Answer 1

Lacking food and ravaged by smallpox disease earlier introduced by one of the Spaniards, the Aztecs, now led by Cuauhtemoc, finally collapsed after 93 days of resistance on the fateful day of 13th of August, 1521 CE. Tenochtitlan was sacked and its monuments destroyed.