U.S. History

Which technological item was invented in the 1940's?

More Questions from U.S. History
The tradition of firing guns at midnight on December 31st in Philadelphia is called what?
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What future President of the United States was called, "Big Steve" by his siblings?
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What was the only state that was formerly a kingdom with a ruling monarch?
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Where did Teddy Roosevelt first publicly say "speak softly and carry a big stick"?
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What are the names of the President George W. Bush's twin daughters?
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How many rooms are there in the White House?
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Which two men appeared on the first two U.S. postage stamps?
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Which President was from New Hampshire?
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