U.S. Geography

What 24.5-acre park in downtown Chicago was opened to the public in 2004?

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Where in South Dakota was gold discovered in 1874?
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Which state has the nickname "Spud State"?
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Which popular Oregon tourist spot is a dormant volcano?
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What river's name changes pronunciation only when it passes through Kansas?
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Who founded the Philadelphia Zoo, which was the first public zoo in the U.S.?
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Which tree gave Ohio its nickname?
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The Ohio River links Ohio with what body of water?
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How many stars are on the official Chicago flag?
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