Even after the accession of four upper-South states, the Confederacy had only one-ninth the industrial capacity of the Union. Northern states had manufactured 97 percent of the country’s firearms in 1860, 94 percent of its cloth, 93 percent of its pig iron, and more than 90 percent of its boots and shoes. The Union had more than twice the density of railroads per square mile as the Confederacy, and several times the mileage of canals and macadamized roads.
