The Declaration of Independence was signed in 1776.
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The steam engine played a major role in the Industrial Revolution.
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The Mongol Empire became the largest contiguous land empire in history.
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The Reconstruction era followed the Civil War.
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The discovery of penicillin by Alexander Fleming revolutionized medicine.
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Edward Jenner developed one of the first vaccines in 1796.
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Operation Paperclip brought German scientists to the United States after World War II.
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The ancient Greeks made major contributions to philosophy and mathematics.
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