Final answer:
The people of Teotihuacan built large structures like the Pyramid of the Sun and the Pyramid of the Moon to showcase their power, wealth, and religious beliefs. These structures attracted pilgrims and trade, bolstering the city's economy and influence in the region.
Step-by-step explanation:
The people of Teotihuacan felt it was important to build such a large structure for several reasons. Firstly, the construction of large structures like the Pyramid of the Sun and the Pyramid of the Moon showcased the power and wealth of the city-state. These structures served as religious and ceremonial centers, symbolizing the relationship between humans and the gods. Additionally, the size and grandeur of these structures attracted pilgrims and trade, bolstering the city's economy and influence in the region.