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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 marked the beginning of mass production in the United States.

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.