Which of the following is the most probable explanation for the American Indian migration? There was no need for them to migrate because they were already here.

They used the Bering Land Bridge.

People traveled from Northern Asia to North America by boat.

We don't know.

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very positive impact on our industries in the west, sine they promoted settlement and increased the ways in which goods could be transported to market.  

continental currency was denominated in dollars from $​1⁄6 to $80, including many odd denominations in between.