Why was francisco pizzarro so easily to defeat Inca?

Francisco Pizarro was able to easily defeat the Inca Empire due to a combination of factors, including the element of surprise, superior weaponry, and the impact of disease. The Incas were already weakened by civil war and diseases like smallpox, which had decimated their population and disrupted their society. Additionally, Pizarro's small but well-armed force, along with the strategic use of alliances with rival indigenous groups, allowed him to capitalize on the Inca's vulnerabilities and ultimately conquer the empire.