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2700 BCE
The Begining of the Olmec civilization
Corn is first cultivated in Mesoamerica. After the discovery of corn the olmec civilization began -
1200 BCE
La Venta
San Lorenzo becomes the great ceremonial centre of the Olmec civilization.Lorenzo, was all but abandoned around 900 BCE at about the same time that La Venta rose to prominence.[20] A wholesale destruction of many San Lorenzo monuments also occurred c. 950s BCE, which may indicate an internal uprising or, less likely, an invasion.[21] The latest thinking, however, is that environmental changes may have been responsible for this shift in Olmec centers, with certain important rivers changing course