U.S. History

Which of the following was designated a national monument first?

More Questions from U.S. History
Who directed research for the Manhattan Project?
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Who was shot by Arthur Bremer while campaigning for the Democratic nomination in 1972?
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What country did U.S. forces invade in 1831?
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Who wrote "It Takes a Village and Other Lessons Children Teach Us"?
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Which political party held the first national political convention?
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From 1998 through 2001, Robert Mueller held what position?
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What year did the Boston Tea Party take place?
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Which hotel was built for the 1904 Louisiana Purchase Exposition in Saint Louis?
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