Question

why were summerians able to form a civilization ?
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Answer 1

Answer:

SUMERIAN CIVILIZATION. The Sumerian civilization emerged upon the flood plain of the lower reaches of the Tigris and Euphrates Rivers about 4000 B.C. The social structure of the Sumerians was decidedly different from other societies of that and later times. ... The political structure of Sumer was independent city-states.

Hope it helps uh....