What are the similarities between the decline of the Aztec and the decline of the Inca?

The declines of the Aztec and Inca civilizations share similarities in their encounters with European colonizers, particularly the Spanish. Both empires faced devastating military defeats due to superior weaponry, tactics, and the introduction of diseases like smallpox, which decimated their populations. Additionally, internal strife and dissatisfaction among subjugated peoples weakened both empires, making them more vulnerable to conquest. Ultimately, both civilizations experienced rapid declines in power and influence following their respective encounters with European forces.