The innovation in manufacturing improved by Henry Ford most changed American industry in the early twentieth century by

While Ford did implement a shorter workday, the primary focus of his innovation was on production efficiency rather than directly changing work hours. The introduction of the assembly line did not inherently reduce work hours; instead, it increased output within the same timeframe, leading to a different approach to labor.

Ford's assembly line actually standardized tasks, allowing unskilled workers to perform specific, repetitive tasks rather than requiring highly specialized skills. This approach democratized manufacturing jobs, making them accessible to a larger workforce instead of narrowing them to skilled labor.

Although automation and machinery were introduced, Ford's innovation primarily focused on optimizing human labor through the assembly line, not outright replacing workers. The assembly line allowed for increased production without significant workforce reduction, emphasizing efficiency instead of mechanization alone.