Highly developed cultures, including those of the Olmecs, Mayas, Toltecs, and Aztecs, existed long before the Spanish conquest. Hernando Cortes conquered Mexico during the period 1519-21 and founded a Spanish colony that lasted nearly 300 years. | Highly developed cultures, including those of the Olmecs, Mayas, Toltecs, and Aztecs, existed long before the Spanish conquest. Hernando Cortes conquered Mexico during the period 1519-21 and founded a Spanish colony that lasted nearly 300 years. |