After people settled in the Mesopotamian region, certain developments led to the formation of the Sumerian Civilization. These developments had a cause and effect relationship. In the flow chart below, name three of these developments. The first development has been provided.

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Ongoing civil wars western roman empire finally collapsed476 c.e. romulus, the last of theroman  emperors in  the west, was overthrown by the germanic leader odoacer, who became the first barbarian to rule in rome. the order that the  roman empire  had brought towestern  europe for 1000 years was no more.