U.S. Geography

Which of these became a U.S. monument in January 1908?

More Questions from U.S. Geography
Delaware's Seashore State Park is located on what beach?
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Which river forms the easternmost boundary of Iowa?
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With a land area of 9,249 square miles, where does Vermont rank among the 50 states?
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What state is nicknamed the "Bay State"?
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What is the state capital of Idaho?
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What is the best-known nickname for Texas?
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With a land area of 46,914 square miles, where does Mississippi rank among the 50 states?
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Nebraska with a land area of 76878 square miles is ranked here compared to other states in total land area?
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