World History

Which one of these inventions or discoveries happened most recently?

More Questions from World History
Denmark is which government type?
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Which leading Nazi was assassinated in 1942 by Czech resistance?
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What nationality was the pirate Bartholomew Roberts known as "Black Bart"?
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What set Cleopatra apart from all other Ptolemaic Rulers of Egypt?
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What was published in Japanese newspapers every month from December 1941 to September 1945?
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What did Spain call the divisions of its conquered land in the Americas?
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Which country was the first to give women the right to vote?
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Which of these was one of the 4 good emperors?
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