World History

Which one of these inventions or discoveries happened most recently?

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Who is Margaret Thatcher?
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Which event occurred during 1819?
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Which Amazon Queen fought in the Trojan War?
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What did "Live Aid" raise money for?
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In which city did the Thirty Years War both begin and end?
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In what country was the Treaty of Versailles signed?
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When did the U.S. sign the Oregon Treaty with the British?
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What year was Mandela sentenced to life imprisonment?
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