From which region did the first migration to North America begin?

Hello love! The answer to your question is Northeast Asia and Southern Siberia

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loess contribute to the flooding of rivers by providing the silt that is washed into rivers and constantly raises the bed of the rivers. this elevation above the surrounding flood plains and dams allow the river to overwhelm the dams and flood thousand of square miles of neighboring flood plains.

the answer is       political office  

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