What weakened the Incan Empire before the Spanish concrete it on earthquake or disease and war or drought and famine?

Answer 1

War and disease were the primary factors that weakened the Incan Empire before the Spanish conquest. The Inca Empire had already been engaged in a civil war (due to a succession dispute between two brothers) when the Spanish arrived, causing internal strife and weakening their military forces. Additionally, diseases brought by the Spanish, such as smallpox, devastated the Incan population, further contributing to their decline. While drought and famine were also issues that impacted the Incan Empire, they were not as significant in weakening the empire as war and disease.