What led most directly to assembly-line porduction?

The most direct catalyst for assembly-line production was the introduction of the moving assembly line by Henry Ford in the early 20th century. This innovation optimized the manufacturing process by breaking down tasks into simple, repetitive actions that could be performed more quickly and efficiently. The assembly line drastically reduced production time and costs, allowing for mass production of goods, particularly automobiles. This method was further supported by advancements in technology and industrial engineering, which facilitated the synchronization of machinery and labor.