Final answer:
The Mississippian Indians are also known as mound builders due to their practice of constructing large earthen mounds. The largest and most well-known settlement of the Mississippian culture was Cahokia.
Step-by-step explanation:
The Mississippian Indians are also known as mound builders due to their practice of constructing large earthen mounds. These mounds served various purposes, including burials, religious ceremonies, and residences for the elite members of society. The largest and most well-known settlement of the Mississippian culture was Cahokia, located in what is now Illinois, which featured impressive mounds and a highly organized social structure.