How the 40-hour workweek began: 10 U.S. labor milestones from 1791 to 1938
The history of the 40-hour workweek runs through 10 U.S. labor milestones, from a 1791 carpenters' strike to the Fair Labor Standards Act of 1938
We haven't written up this one. Quartz has the full story — the link below goes straight to it.