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Four Iowa class battleships were built in the early 1940s in the United States. Two others were laid down but were scrapped prior to completion. Built with cost as no object, the Iowas are arguably the finest battleships ever built. The Iowa-class was preceded by the South Dakota class, and would have been succeeded by the Montana class if the Montanas had not been cancelled prior to construction. The design of the Iowa class was based upon that of the South Dakota class but with more powerful engines, larger guns and an additional 200 feet (60 m) of length for improved seakeeping. The Iowa class was the last battleship line built by the United States, as naval power had shifted to being primarily aircraft carrier based. These ships were launched during the Second World War, and all of them saw action throughout the 20th century. All four of the completed ships were recommissioned in the 1980s, only to be decommissioned in the 1990s after the Cold War ended.