1. Superior Military Technology: The Spaniards possessed superior military technology compared to the Aztecs. They used advanced weapons such as firearms (arquebuses, muskets, and cannons), steel swords, and crossbows. Firearms were particularly effective against Aztec warriors who were largely armed with obsidian-tipped spears, bows and arrows, and wooden clubs.
2. Native Allies: Cortes formed alliances with various indigenous tribes who were already dissatisfied with Aztec rule. The most notable alliance was with the Tlaxcalans, a powerful city-state that had long resisted Aztec domination. The Tlaxcalans provided significant military support, manpower, and intelligence to Cortes.
3. Psychological Warfare: Cortes employed psychological tactics to demoralize the Aztecs. One notable tactic was the use of horses. The Aztecs had never encountered horses before and were terrified by these large and powerful animals. The Spanish cavalry exploited this fear to great effect on the battlefield.
4. Disease: The arrival of the Europeans brought devastating diseases such as smallpox, measles, and influenza to the Americas. These diseases spread rapidly through the Aztec population, decimating their numbers. The Aztecs suffered heavy losses due to illness, weakening their defenses against the Spanish.
5. Internal Aztec Conflicts: At the time of Cortes' arrival, the Aztec Empire was also facing internal conflicts and political divisions. Some Aztec city-states resented the dominance of the ruling city, Tenochtitlan. These divisions prevented a unified resistance against the Spanish invasion.
It's important to note that Cortes' victory was not a quick or straightforward conquest. The Spanish faced fierce resistance from the Aztecs and suffered significant losses. However, the combined factors mentioned above ultimately contributed to Cortes' conquest of the Aztec Empire.