Early Mesoamerica A Chronological History of Cultures & Societies Up to the Start of the Common Era

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While the existence of conclusive data on how and when Mesoamerica was first populated is still wanting in substance, it is generally accepted that the first people to arrive in the New World did so around 18,000 years ago. Occasionally data will surface that suggests that pre-modern humans may have come to the Americas prior to 16,000 BCE, but these conclusions are largely speculative, or based on data that cannot be corroborated. It is unknown if the migration played out as a single event, or if it happened in a succession of waves. Regardless, there are a few prominent theories on how genetically modern humans were able to make the last great migration from the Old World into the Americas. In any case, despite our murky understanding of how humans arrived in Mesoamerica, it is clear that once there, human civilization and culture was not only able to subsist, but thrive under a set of conditions that were unique to the region.
The most widely understood theory of human beginnings in the Americas involves a land bridge that would have “extended over what is now the Bering Strait and linked north-eastern Siberia to Alaska.” A migration of this sort would have necessarily occurred prior to 9,500 BCE during the last of Earth’s glacial maximums. During this glacial period the sea levels would have been relatively low, exposing the areas of Beringia that are currently underwater. This land bridge — as it is often referred — would have supported large herds of several species of megafauna, such as mammoth, bison, and horses. Paleolithic hunters and gatherers could have easily followed these herds out of the Eurasian tundra and into North America.
An alternative theory suggests that humans may have traveled to the Americas...

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... several major epicenters of trade and culture. They were set on course to become a fully actualized civilization and a center of Mesoamerican culture.

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Flannery, Kent V. "Archeological Systems Theory and Early Mesoamerica." Anthropological Archeology In The Americas. (1968). http://www.neiu.edu/~circill/hageman/anth396/archaeologicalsystems.pdf (accessed March 17, 2014).
MacNeish, Richard S. "Ancient Mesoamerican Civilization." SCIENCE. no. 3606 (1964). http://www.clas.ufl.edu/users/dcgrove/mexarchreadings/ancient.pdf (accessed March 17, 2014).
Scarre, Christopher. The Human Past: World Prehistory & the Development of Human Societies. New York: Thames & Hudson, 2013.

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