An ancient region of southwest Asia between the Tigris and Euphrates rivers in modern-day Iraq. Probably settled before 5000 B.C., the area was the home of numerous early civilizations, including Sumer, Akkad, Babylonia, and Assyria. It declined in importance after Mongol invaders destroyed its extensive irrigation system in A.D. 1258
Alex, your post is long enough but you need to hurry to get through all the civilizations.
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