Final answer:
The Aztec Empire fell first among the options provided due to the arrival of the Spanish conquistadors led by Hernán Cortés in 1520, resulting in the downfall of Tenochtitlan and the Aztec civilization by 1521.
Explanation:
The Aztec Empire fell first among the options provided. The Spanish, led by Hernán Cortés, arrived in Tenochtitlan in 1520, leading to violence and the death of Aztec leader Montezuma. By 1521, Tenochtitlan was destroyed, marking the end of Aztec civilization.
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