U.S. Geography

Which of these is the longest river in the United States?

More Questions from U.S. Geography
The Woodstock Music and Arts Fair of the 1960's was actually held in what New York city?
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Which state is bordered by these states: Minnesota, Montana and South Dakota?
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What rock was adopted as Missouri's official state rock in 1967?
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Wyoming was the first state to grant the right to vote to whom?
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In which state of the USA would you find a town called Happy Jack?
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What is the two letter postal abbreviation for the state of New York?
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Which river forms most of the western border of Louisiana?
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You can find the Lowell Observatory at which location?
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