The document summarizes the major pre-Columbian cultures of the Americas before 1492, including the Olmecs in Mexico from 2500 BCE - 100 AD, the Zapotecs in Mexico from 2000 BCE - 750 AD, and the Mayans in southern Mexico and Central America from 2000 BCE - 1250 AD. It describes some of their key achievements like calendars, ball games, cities, and advanced mathematics and astronomy for the Mayans. The document provides images and details about the cultures, civilizations, religions, and cities that existed in North, Central, and South America before European contact.