19th century Alert (Ship) Armored vessels Atlanta (Steam ram) (Ship) Brooklyn (Ship) Chicago (Ship) Defenses Dolphin (Ship) Economic aspects Eliza Adams (Ship) Franklin (Ship) Hartford (Ship) Kearsarge (Sloop) Marion (Ship) Merrimack (Frigate) New Ironsides (Ironclad) (Ship) Operational readiness Ordnance, Naval Passaic (Ironclad) (Ship) Powhatan (Side-wheel steamer) (Ship) Sea-power Shipbuilding Ships Tennessee (Side-wheel steamer) Terror (Ship) Trenton (Ship) United States United States Navy