What was one direct effect of the assembly line on labor day in the 1900s?

One direct effect of the assembly line on Labor Day in the 1900s was the significant increase in worker productivity, which led to higher production rates and economic growth. This efficiency also resulted in longer working hours and more demanding work conditions, prompting labor movements to advocate for better rights and shorter hours. Consequently, Labor Day became a symbol of the fight for workers' rights and the need for fair labor practices in response to the challenges posed by industrialization.