Why was the Nile river nicknamed Lifeblood of Egypt l because?

During the annual flooding of the Nile, which typically lasted from July through November, farming was impossible. But when the waters receded, a thick layer of fertile silt over the farmlands remained to insure rich soil for their crops and thick grasses for their grazing animals. The Nile was the lifeblood of Egypt.

Explanation:

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the graphs indicate that few people in bolivia work in industry, as that is the least expressive sector shown in the respective graphic.

answer:

it caused mass african migration, african populations to grow, african empires to topple, and racism against slaves to emerge.