For much of its history, North Adams was a mill town. Manufacturing began in the city before the Revolutionary War, largely because the confluence of the Hoosic River's two branches provided water power for small-scale industry. By the late 1700s and early 1800s, businesses included wholesale shoe manufacturers; a brick yard; a saw mill; cabinet-makers; hat manufacturers; machine shops for the construction of mill machines; marble works; wagon and sleigh-makers; and an ironworks, which provided the pig iron for armor plates on the Civil War ship, the "Monitor".