Why did the Inca Empire fall?

The Inca Empire fell primarily due to a combination of internal strife and external pressures. Civil war among rival factions weakened the empire, particularly after the death of Emperor Huayna Capac. This internal conflict coincided with the arrival of Spanish conquistadors, led by Francisco Pizarro, who took advantage of the Inca's disunity and used superior weaponry and tactics to conquer the empire. Additionally, the spread of diseases like smallpox, which decimated the indigenous population, further contributed to their decline.