The collapse of the Aztec Empire was primarily due to the Spanish forces' attack on and capture of their capital, aided by military superiority and diseases like smallpox.
Spanish forces attacked and captured the capital of the Aztec Empire, which was one of the main factors that led to the collapse of the Aztec Empire. The Spanish conquistadors, led by Hernán Cortés, used advanced military tactics and weaponry to defeat the Aztecs. Additionally, the inadvertent introduction of diseases like smallpox decimated the Aztec population.
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