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History 15 Online
OpenStudy (anonymous):

What geographic factors led to the decline of Sumer? A. The Tigris and Euphrates rivers flooded every year leaving behind dark, fertile soil. B. Grain fields of one city-state bordered those of another, which caused territorial wars. C. The cultivated soil had poor drainage. D. It was located in a flat plain, and isolated from trade routes.

OpenStudy (anonymous):

C & D.

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