The progressive era lasted from ?

So, The progressive era was from the 1890's to the 1920's.

Explanation: The progressive era was an era of business expansion and progressive reform in the United States. The progressives, as they called themselves, worked to make American society a better and safer place in which to live. The Era was sent to an abrupt stop around World war I times.

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.