Why were other groups able to conquer the city states of Sumer

Around 2,300 BC, the independent city-states of Sumer were conquered by a man called Sargon the Great of Akkad, who had once ruled the city-state of Kish. Sargon was an Akkadian, a Semitic group of desert nomads who eventually settled in Mesopotamia just north of Sumer

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answer; i believe the correct answer is (federalist);

well to answer ur question to be completly honest