How Long Have People Lived in Mexico?

Archaeological evidence indicates human presence in Mexico dating back at least 15,000 years (end of the Last Glacial Maximum). The earliest widely accepted sites belong to the Paleo-Indian period.

Key Early Sites

• Tlapacoya (Valley of Mexico): Stone tools and animal remains dated to ~24,000–22,000 BP (contested); more secure dates ~15,000 BP.
• El Cedral (San Luis Potosí): Mammoth kill site, ~12,000 BP.
• Chiquihuite Cave (Zacatecas): Stone tools suggesting occupation ~26,000–30,000 BP (published 2020, still debated).

From Foragers to Civilizations

1. Paleo-Indian (until ~8000 BC): Big-game hunters, Clovis/Folsom points.
2. Archaic (~8000–2000 BC): Diversified foraging, early plant cultivation (squash, maize).
3. Preclassic/Formative (~2000 BC – 250 AD): Sedentary villages, pottery, Olmec civilization (Gulf Coast).
4. Classic (250–900 AD): Teotihuacan, Maya city-states, Zapotec Monte Albán.
5. Postclassic (900–1521): Toltecs, Aztecs (Mexica), Tarascans, Mixtecs.

By 1519, the population of Mesoamerica may have exceeded 20 million. Continuous cultural evolution makes Mexico one of the world's few "pristine" civilization hearths.