How was the fall of the Inca empire similar to the fall of the Aztec empire?

The fall of the Inca Empire and the Aztec Empire shared similarities in that both were significantly weakened by internal strife and civil wars prior to the arrival of Spanish conquistadors. Both empires faced challenges from rival factions, which made them more vulnerable to external conquest. Additionally, the introduction of European diseases devastated their populations, undermining their ability to resist invasion. Ultimately, both empires fell to the military might and strategic alliances formed by the Spanish, leading to their rapid collapse.