U.S. Geography

What is the two-letter postal abbreviation for the state of Colorado?

More Questions from U.S. Geography
Which two European countries both claimed the Ohio Territory as theirs?
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Which of these became a U.S. monument in January 1908?
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What is the longest river that lies entirely within the state of Ohio?
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F. Scott Fitzgerald House is located where?
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What state has a spoon museum?
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How many men died while building the Golden Gate Bridge?
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Where is the annual Iowa State Fair held?
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The nickname of which English monarch is reflected in the name of West Virginia?
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