The Missouri River is the longest river in North America. Rising in the Rocky Mountains of the Eastern Centennial Mountains of Southwestern Montana, the Missouri flows east and south for 2,341 miles before entering the Mississippi River north of St. Louis, Missouri.
Question: <u><em>whats the longest river is north america</em></u>
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Assuming you're referring to the period surrounding the Civil War--one example would be that Republicans wanted to make slavery illegal, which would have "controlled" the private lives of slaveholders in the South.