Final answer:
If the Spanish had conquered the Aztecs, Mexico City would have undergone significant cultural and societal changes influenced by Spanish customs and institutions.
Step-by-step explanation:
If the Spanish had successfully conquered the Aztecs and taken control of Tenochtitlán, the city would have likely undergone significant changes. The Spanish renamed Tenochtitlán as Mexico City and it became the capital of the colony of New Spain. The city would have experienced cultural, architectural, and religious transformations as the Spanish imposed their customs and institutions on the indigenous population. The Spanish also brought diseases like smallpox, which would have had a devastating impact on the population and could have led to changes in the city's demographics and social structure.