Powered by children seven to 12 years old working dawn to dusk, Samuel Slater?s thread-spinning factory goes into production in Pawtucket, R.I., launching the Industrial Revolution in America. By 1830, 55 percent of the mill workers in the state were youngsters, many working for less than $1 per week - 1790
An explosion in the Darr Mine in Westmoreland Co., Pa., kills 239 coal miners. Seventy-one of the dead share a common grave in Olive Branch Cemetery. December 1907 was the worst month in U.S. coal mining history, with more than 3,000 dead - 1907