Largest pre-Columbian city north of Mexico (peak pop. ~10,000–20,000). Mound 72 contains mass burials of probable sacrificial victims (young women, beheaded men). A massive wooden palisade with bastions enclosed the central precinct — consistent with expectations of external military threat. Evidence of inter-regional conflict documented by Pauketat, Emerson, and others. Site is a UNESCO World Heritage Site and NRHP-listed.
Indigenous peoples had inhabited North America for at least 15,000 years before European contact, developing complex societies across every region of the continent. The Mississippian culture, centered on the city of Cahokia near present-day St. Louis, reached its peak around 1100 AD with a population estimated at 10,000 to 20,000 — larger than contemporary London. The Ancestral Puebloans built multi-story stone complexes at Chaco Canyon and Mesa Verde between the 9th and 13th centuries. The Iroquois Confederacy, formed between roughly 1450 and 1600, united five nations under a constitution that influenced later American democratic thinking. Across the eastern woodlands, the Great Plains, the Pacific Coast, and the Southwest, hundreds of distinct nations maintained sophisticated trade networks, agricultural systems, and governance structures. European contact beginning in the late 15th century introduced epidemic disease — smallpox, measles, influenza — which devastated Indigenous populations by an estimated 50 to 90 percent within a century.
Dozens of individuals in Mound 72 mass burials; broader conflict casualties unknown
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