Answer:
Deadly disease
Step-by-step explanation:
In 1521, Hernan Cortez on behalf of the Spanish crown and in the hope of finding golds in the New World invaded Aztec empire in Tenochtitlán, a location in the present day of Mexico.
Hernan Cortez and his group of soldiers and allies were able to invade and conquer the Aztec empire by various factors, some of which includes superior weapons, like guns, horses for fighting, metal armor, and deadly diseases such as smallpox, measles, and influenza