The document provides a detailed overview of the history and civilizations of ancient Mexico, beginning with the first humans who migrated from Asia around 40,000 years ago. It discusses the major pre-Columbian civilizations that arose including the Olmec, Teotihuacan, Maya, Toltec, and Aztec empires. The Maya are described in particular depth, highlighting their advanced mathematics, calendars, and city-states, before environmental challenges including deforestation led to the decline and abandonment of the classic Maya cities between 800-950 AD. The document also outlines the rise and fall of the powerful Aztec empire that dominated central Mexico prior to the Spanish conquest in the early 16th century.