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Which major river forms the entirety of Iowa's western border with Nebraska?

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Correct answer: Missouri River

The Missouri River defines the western boundary between Iowa and Nebraska. On the eastern side, the Mississippi River forms the entire border, making Iowa the only US state whose eastern and western borders are formed entirely by rivers. Photo: Christopher Michel, Wikimedia Commons, CC BY-SA 4.0.

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Source: Wikipedia (CC BY-SA)

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