Why was Montezuma 2 so important to the Aztecs?

Montezuma II was crucial to the Aztecs as he was the emperor during the empire's peak, overseeing significant territorial expansion and the consolidation of power. He is known for his ambitious building projects, including the expansion of Tenochtitlán, and for fostering a rich cultural and religious life. Additionally, his reign marked the arrival of Spanish explorers, which ultimately led to the empire's downfall, making his leadership pivotal in both the height and decline of Aztec civilization.