The discovery of vaccines reduced childhood mortality rates.
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The Boer War was fought in southern Africa at the turn of the 20th century.
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The Cold War shaped global politics for much of the 20th century.
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The longest tennis match in history lasted over 11 hours.
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The CIA declassified documents regarding covert Cold War activities in the 1990s.
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The United States Constitution is one of the oldest written national constitutions still in use.
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Ancient Egyptian armies used chariots in battle.
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The ancient city of Troy was discovered in modern-day Turkey.
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The Viking Age saw Norse exploration across Europe and the Atlantic.
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