One of the most distinguishing features of Native American societies in the Mississippi River Valley was the building of

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Native American societies in the Mississippi River Valley were known for building mounds, which were earthen structures used for various purposes including burial sites, ceremonial sites, and settlements. These mounds were often built in complex arrangements, such as the Cahokia Mounds in present-day Illinois, which included more than 100 mounds and a central plaza. The other options (pyramids, irrigation systems, ziggurats, and temples) are associated with other ancient civilizations such as the Maya, the Incas, and the Mesopotamians, but not with Native American societies in the Mississippi River Valley.

One of the Most Distinguishing Features of Native American Societies