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Eli Whitney applied for a patent of his cotton gin on October 28, 1793. The patent was granted on March 14, 1794, but was not validated until 1807.
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The Missouri Compromise was passed by Congress on March 3, 1820 and signed into law by President James Monroe on March 6, 1820.
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Thomas Edison created the light bulb on October 21, 1879, but Humphry Davy created the Electric Light in 1809
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