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  Around this time, the major cities of Maya were at this height.
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  By the 700's, warfare had broken out amoung the various mayan city-states. This caused some maya to flee their cities and take refuge in the jungle.
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  The maya were already practicing a form of village based agriculture.
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  Inca was formed in the valley of cuzco in the 1200's.
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  The aztecs arrived in the Valley of Mexico around A.D. 1200.
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  By the 1500's, Tenochtitlan had an estimated population of 200,000 people.
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  By the 1500's, the inca ruled an empire that streched 2,500miles along the western coast of South America. From Ecuador in the north Chile and Argentina in the south.
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  In the early 1500's, the Inca empirewas at the height of it's glory.
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  Around this time, Maya the great cities of the central Maya area. Ending the classical period.