Which is true of the Aztec empire at the time of Cortes?

At the time of Hernán Cortés's arrival in 1519, the Aztec Empire was a powerful and expansive civilization in Mesoamerica, known for its advanced agricultural practices, complex social structure, and impressive architectural achievements, including the capital city of Tenochtitlán. The empire was ruled by Emperor Moctezuma II and was characterized by a tribute system that maintained control over various subjugated city-states. However, the Aztecs were also facing internal strife and dissent among conquered peoples, which Cortés exploited to gain allies and ultimately led to the empire's downfall.