This document provides an overview of early civilizations in Mexico and their history up until the Spanish colonization period. It discusses the Olmecs as the first known civilization from 1500-400 BCE, the Mayans from 2600 BCE to present who had many cities and advanced writing, and the Aztecs from 1400-400 BCE who had complex economic and legal systems. It then summarizes how the Spanish led by Cortes conquered the Aztecs in 1519 despite technological advantages, and the beginnings of Mexican independence led by Miguel Hidalgo.