U.S. History

What year was the polio vaccine developed by Jonas Salk?

More Questions from U.S. History
President George W. Bush has used the "Resolute Desk" in the Oval Office which is made from what?
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Which U.S. President appointed the first woman to the U.S. Supreme Court?
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What does the "E" stand for in Robert E. Lee?
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Who was the U.S. President during the Mexican War?
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Where was the first shot of the Civil War fired?
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What was Governor Schwarzenegger's first executive order?
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What war did Senator John McCain fight in?
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What was the name of Chief "Crazy Horse" before he got his nickname?
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