The Promontory Cave assemblages (excavated by Steward 1937) represent an intrusive population in the eastern Great Basin c.1250–1400. The pottery-free assemblage with distinctive moccasin style has been interpreted as evidence of a southward migration of proto-Athabascan peoples — the ancestors of the later Navajo and Apache. The movement of this group into established territories must have involved conflict, though direct massacre evidence has not been formally published.
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.
Promontory culture (proto-Athabascan) groups in conflict with Great Salt Lake populations
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