The second great American job machine took hold during the mid-19th century, propelled by the surge in manufacturing. By late in the century, some 60 percent of the workforce had been absorbed in industrial jobs while agricultural work dropped to roughly ten percent of employment. Industrial and blue-collar manufacturing jobs would power America's economic and employment growth for the better part of the next century, until roughly1950. But for most of those years, it was low-wage, long-day, dirty and dangerous work -- it wasn't until the Great Depression, the New Deal, and post WW II prosperity that blue-collar jobs became good, family supporting jobs.