United States battleships were large, heavily armed warships designed for naval warfare. They played a crucial role in the U.S. Navy from the late 19th century until the mid-20th century. Notable classes include the Iowa-class and South Dakota-class, which were equipped with powerful guns and armor to engage enemy ships and provide naval gunfire support. Battleships were instrumental during major conflicts, such as World War I and World War II. However, advancements in naval technology, particularly the rise of aircraft carriers, led to their decline in the post-war era. The last battleships were decommissioned in the 1990s, marking the end of an era in naval history.