The construction of the Great Wall of China took over 2,000 years, spanning multiple dynasties.
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The Ottoman Empire fell after World War I.
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Roman roads allowed rapid troop movement.
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The discovery of anesthesia allowed painless surgical procedures.
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The ancient city of Carthage was a major Mediterranean power.
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In 2002, scientists recreated ancient pigments to understand historical art techniques.
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The United States Constitution established a system of checks and balances.
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