U.S. Geography

In which U.S. state includes the cities of Columbus, Cleveland, Cincinnati and Dayton?

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What was the first capital of Indiana?
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Where is America's "official" Christmas tree?
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What city or place is Andrew Carnegie Mansion in?
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What river do many of Ohio's streams flow into?
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Where were Jacqueline Bouvier Kennedy and John F. Kennedy married?
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The Lincoln Park Zoo is the oldest public zoo in America; what year was it founded?
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Which Washington state volcano erupted in 1980?
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Which dairy product is Wisconsin famous for?
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