In which year did Eli Whitney contribute to mass production?

Eli Whitney contributed to the concept of mass production with his invention of the cotton gin in 1793 and even more significantly through his introduction of interchangeable parts in the manufacturing of muskets in the late 18th century. This approach allowed for the efficient production and assembly of large quantities of products. The year 1780 corresponds closely to the time when Whitney began conceptualizing and developing his ideas on manufacturing techniques. His contributions were pivotal in laying the groundwork for mass production methods that became prevalent in the 19th century. The other years listed do not connect to his work or the early development of mass production techniques.