Dated ca. 1970-1990, this photograph shows a steel mill in Cleveland, Ohio. Cleveland Steel Mills helped to establish the eight hour work day. In the early nineteenth century, there were a number of furnaces in Ohio that processed iron. These small industries were made possible by local iron ore deposits in southern and eastern Ohio. In addition, some parts of Ohio also had coal deposits that could be used to fuel furnaces. Because of their proximity to the state's iron manufacturing, by the second half of the nineteenth century communities such as Cleveland, Akron, Canton, and Youngstown had begun to emerge as major industrial cities. Railroads also encouraged the growth of the iron industry. After the American Civil War, iron manufacture...