Why did the ancient Egyptians build dams and channels? to defend settlements from invasion
to make it easier to sail up the Nile
to better control flooding from the Nile
to enable people to cross the Nile to trade

To better control flooding from the Nile is the answer.

- "the past is made of multitudinous items ranging from anything that can be collected, recollected or assessed to originate in the past. as such, the past is a gallimaufry of particulars that may not have been related in any way. however, the human mind seeks organization to understand concepts and other things. the human mind therefore seeks relationships in explaining and studying the past. history being a humanity, dictates that historians have to serve this human trait by bringing structure to details of the past. historians do this by creating interpretive frameworks that capture as many details as possible."

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i really really really really really really dont know