Because of the Fertile Cresent which is a fertile strip of farmland. It is near Asia Minor, Egypt, and Mesopotamia. But each group didn't stay long because there were no natural barriers and invaders came in. The first settlers in the Fertile Cresent were the Sumerians. Hope this helped!
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Answer:
Not until 1995 did Vietnam release its official estimate of war dead: as many as 2 million civilians on both sides and some 1.1 million North Vietnamese and Viet Cong fighters. The U.S. military has estimated that between 200,000 and 250,000 South Vietnamese soldiers died in the war.