The Late Woodland period in the Northeast (c.700–1200 CE) shows the beginnings of the fortification pattern that defines Iroquoian culture. Kipp Island phase sites in the Finger Lakes and Oswego basin area show early evidence of palisades and skeletal trauma, representing the beginning of the endemic warfare cycle documented in detail by Engelbrecht, Williamson, and others for the subsequent Owasco and Iroquois periods.
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.
Kipp Island phase Late Woodland groups in central New York
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