How did northern industries change to meet the demands of the US civil war?

During the U.S. Civil War, northern industries rapidly transformed to meet the demands of wartime production. Factories retooled to manufacture weapons, ammunition, uniforms, and other military supplies, often operating around the clock. Innovations in machinery and production techniques, such as the use of interchangeable parts, increased efficiency and output. Additionally, the demand for goods led to a surge in labor, with many women and immigrants entering the workforce to support the war effort.