Eli Whitney
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Eli Whitney was born on December 8, 1765 in Westborough, Massachusetts. He was an American inventor who patented the cotton gin on March 14, 1794. In 1798, he built a factory that made guns by machinery. This was the first introduction to interchangable parts; you could take a part off of one gun and it would fit another. This marked the beginning of mass production in the United States.