First Civilizations Of The Americas
The western hemisphere was populated through series of migration from the Asian mainland. The declining sea levels of the last ice age, resulted in a formation of a land bridge that connected Siberia with present day Alaska. Many scholars believed the first migration occurred during the period 20,000-13,000 B.C.E. For at least twenty thousand years peoples in the Western Hemisphere lived in a virtual isolation from the rest of the world.
Over thousands of years, the descendants of the people increased in number, and traveled throughout the whole hemisphere. Two of the most impressive cultural traditions developed in Mesoamerica, and in the Andean region of South America. The Olmecs "Rubber people" in Mesoamerica, and Chavins in the Andes.The legacies of the two important civilizations would persist in Mesoamerica and the Andes for thousands of years. Both served as formative parent cultures for the civilizations to come in the area and had influences equivalent to those of river valleys seen in the ancient times of the eastern hemisphere.
History of the Olmecs
5300 BC, Corn grown as crop.
1200 BC - 400 BC, La Venta
c.1150 BC, Olmecs begin to rise in Sam Lorenzo. About 1000 people.
c. 1000 BC, Olmecs came into being.
c.900 BC, Sam Lorenzo was abandoned
La Venta became the main city.
Mounds were replaced by pyramids.
c.700 BC, Founding of Monte Alban the sacred city of the Olmecs.
c.650 BC, first evidence of writing in the New World
c.600 BC, Oaxaca becomes the main center of Olmec culture
c.400 BC, La Venta comes to its end.
100 BC, Olmecs mysteriously disappeared