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ca. 400,000 BP	Homo sapiens evolve in Africa.
ca. 25,000–14,000 BP	Glaciation exposes Beringia land bridge.
ca. 15,000 BP	Humans arrive in North America.
ca. 13,500–13,000 BP	Paleo-Indians use Clovis points.
ca. 11,000 BP	Extinction of mammoths.
ca. 10,000–3000 BP	Archaic hunter-gatherer cultures dominate ancient America.
ca. 5000 BP	Chumash culture emerges in southern California.
ca. 4000 BP	Eastern Woodland peoples grow gourds, make pottery.
ca. 3500 BP	Southwestern cultures cultivate corn.
ca. 2500 BP	Eastern Woodland cultures build burial mounds, cultivate corn.
ca. 2500–2100 BP	Adena culture develops in Ohio.
ca. 2100 BP–AD 400	Hopewell culture emerges in Ohio and Mississippi valleys.
ca. AD 200–900	Mogollon culture develops in New Mexico.
ca. AD 500	Bows and arrows appear south of Arctic.
ca. AD 500–1400	Hohokam culture develops in Arizona.
ca. AD 800–1500	Mississippian culture flourishes in Southeast.
ca. AD 1000–1200	Anasazi peoples build cliff dwellings and pueblos.
ca. AD 1325–1500	Mexica establish Mexican empire.
AD 1492	Christopher Columbus arrives in New World.