U.S. History

In 1910, Thomas Edison was credited with which invention/discovery?

More Questions from U.S. History
Which Europeans founded the city of New Orleans in 1718?
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What was the name of the pig nominated for President by the Yippies in Chicago in 1968?
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What were the first two American Universities to grant the PhD in chemistry?
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Where was the battle of Bunker Hill fought?
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What cabinet post did John Ashcroft hold under President George W. Bush?
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From 1998 through 2001, Robert Mueller held what position?
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Who was the first American President to die in office?
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What was the population of the U.S. in 1972?
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