Archaeologists estimate the mound was built between 250 and 150 BCE by the Adena culture.
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They produced great mounds, and the Monk's Mouund which was over 100 ft. tall.
Anasazi
For religious purposes
It is the Hopewell.
Yes, there are Indian mounds in Missouri. These mounds were built by indigenous peoples in the region for various purposes, such as burial sites, ceremonial structures, and residential areas. The most well-known Indian mounds in Missouri are found at Cahokia Mounds State Historic Site, which is located near Collinsville, Illinois, just across the Mississippi River from St. Louis. These mounds are part of the UNESCO World Heritage Site of Cahokia Mounds, which preserves the largest pre-Columbian settlement north of Mexico.