What significant event marked the end of the Aztec Empire?

• A. The arrival of European diseases
• B. The defeat in a major battle
• C. The execution of its last emperor
• D. The loss of trade routes with Spain

Answer: (A)

The arrival of European diseases played a crucial role in the collapse of the Aztec Empire. When Hernán Cortés and his forces arrived in 1519, they brought with them diseases like smallpox, which the indigenous populations had no immunity against. These diseases swept through the Aztec population, leading to devastating mortality rates. The loss of a significant portion of the population weakened the empire's social structure, military capabilities, and ability to resist the encroachment of the Spanish conquistadors. This catastrophic health crisis, combined with military confrontations and political maneuvering by Cortés, created a situation in which the Aztec Empire could not effectively respond to the challenges it faced, contributing to its eventual fall in 1521.

Other choices, while they may pertain to the empire's decline, do not encapsulate the primary factor as significantly as the arrival of diseases. Major battles and the fate of its rulers were part of the broader story, but they were influenced heavily by the impact of disease on the Aztec population. The loss of trade routes with Spain would not pertain directly to the collapse of the Aztec Empire, especially since it was the arrival of the Spaniards that marked the beginning of their imperial conflict, rather than the loss