What is the name of great city built by the mound builders?

The great city built by the Mound Builders is known as Cahokia. Located near present-day Collinsville, Illinois, Cahokia was the largest pre-Columbian city in North America, flourishing from around 600 to 1400 CE. It is renowned for its massive earthen mounds, with Cahokia Mound being the largest, serving as a central ceremonial site. The city was a significant cultural and political center for the Mississippian culture.