US ResearchConflictsColonial and Pre-ColumbianCahokia Warfare Period
Colonial and Pre-Columbian

Cahokia Warfare Period

1100
Illinois
Era
Colonial and Pre-Columbian
Year
1100
Location
Illinois
Status
Historical record
The Combatants

Who Fought

Forces
Not recorded in historical accounts
Forces
peripheral or rival groups
VS
Victor
Not recorded in historical accounts
Forces
Cahokia polity military forces
Outcome
Multiple lines of evidence for organized violence: mass sacrificial burials in Mound 72, a palisaded fortification surrounding the civic precinct, and evidence of coercive control. Population decline after c.1200 may relate to internal conflict or external pressure.
The Battle

History & Significance

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.

Historical context

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.

Casualties & Losses

Dozens of individuals in Mound 72 mass burials; broader conflict casualties unknown

Questions & Answers

Frequently Asked Questions

When did Cahokia Warfare Period take place?
Cahokia Warfare Period took place in 1100.
Where was Cahokia Warfare Period fought?
Cahokia Warfare Period was fought in Illinois, United States.
What was the outcome of Cahokia Warfare Period?
Multiple lines of evidence for organized violence: mass sacrificial burials in Mound 72, a palisaded fortification surrounding the civic precinct, and evidence of coercive control. Population decline after c.1200 may relate to internal conflict or external pressure.
What was the significance of Cahokia Warfare Period?
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. Evidenc
Protected heritage nearby

Historic Sites near Cahokia Warfare Period

Cahokia Mounds
Pre Contact · 0.5 mi
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Cahokia Tract 15A Mass Grave
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Cahokia Palisade Defense Conflict
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Dickson Mounds Warfare Illinois
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Cahokia East St. Louis Mass Sacrifice
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Lohmann Phase Cahokia Warfare
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Kincaid Site Defensive Conflict
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Cahokia Woodhenge Sacrificial Deposits
1050
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Cahokia Warrior Burial Mound 72
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Cahokia Palisade Conflict – East St. Louis
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Cahokia Hinterland Conflict – East St. Louis Mound Group
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Mund Site Mass Burial – Illinois River
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Red Ocher Culture Conflict – Illinois Valley
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All battles in Illinois
Source

Content adapted from Wikipedia under the Creative Commons Attribution-ShareAlike 4.0 International License.

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