As the river rises: Cahokia’s emergence and decline linked to Mississippi River flooding

http://feeds.sciencedaily.com/~r/sciencedaily/~3/KB5QjPv6PMo/150504154946.htm

As with rivers, civilizations across the world rise and fall. Sometimes, the rise and fall of rivers has something to do with it. At Cahokia, the largest prehistoric settlement in the Americas north of Mexico, new evidence suggests that major flood events in the Mississippi River valley are tied to the cultural center’s emergence and ultimately, to its decline.

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