It was 1913 in Highland Park, MI where a winch and a rope moved Model Ts through the Highland Park Assembly Plant where 140 factory workers performed defined jobs to complete a brand new Ford Model T car.
Henry Ford did not invent the assembly line. It was Cadillac founder Henry Leland, who introduced to the auto industry the concept of interchangeable parts. However, Ford was first to implement the line, allowing Ford Motor Co. to increase production of its Model T.
The assembly line is what allowed the middle class to come of age and make the United States an industrial powerhouse.