U.S. Geography

Which state is known as the "Keystone State" and includes Pittsburgh?

More Questions from U.S. Geography
What U.S. state is 16th in land area and is bordered by six other states?
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Where is the nation's largest limestone deposit, located in Nebraska?
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Which U.S. state is appropriately named the "Pineapple State"?
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What is the two-letter postal abbreviation for the state of Colorado?
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The Woodstock Music and Arts Fair of the 1960's was actually held in what New York city?
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What did William Mulholland complete in Los Angeles in 1913?
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Which of these fruits is California known for?
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Who founded the Philadelphia Zoo, which was the first public zoo in the U.S.?
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