For What was China's Han Dynasty most noted?

The Han dynasty (206 BCE–220 CE) is known its long reign and its achievements, which included the development of the civil service and government structure; scientific advancements such as the invention of paper, use of water clocks and sundials to measure time, and development of a seismograph

labor leaders and organizations had the power to demand it.

explanation:

workers got a five-day workweek because the bcea protects and respect the rights of the employees. labor leaders and other groups demanded it.