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==Background==
The vessels that eventually became the ''Iowa''-class battleships were born from the U.S. Navy's [[War Plan Orange]], a Pacific war plan against Japan. War planners anticipated that the U.S. fleet would engage and advance in the Central Pacific, with a long line of communication and logistics that would be vulnerable to high-speed Japanese cruisers and capital ships. The chief concern was that the U.S. Navy's traditional 21-knot battle line of [[Standard-type battleship|"Standard-type"]] battleships would be too slow to force these Japanese task forces into battle, while faster aircraft carriers and their cruiser escorts would be outmatched by the Japanese {{sclass|Kongō|battlecruiser|0}} battlecruisers, which had been upgraded in the 1930s to [[fast battleship]]s. As a result, the U.S. Navy envisioned a fast detachment of the battle line that could bring the Japanese fleet into battle. Even
Another factor was the "escalator clause" of the [[Second London Naval Treaty]], which reverted the gun caliber limit from {{convert|14|in|0}} to {{convert|16|in|0}}. Japan had refused to sign the treaty and in particular refused to accept the 14-inch gun caliber limit or the 5:5:3 ratio of warship tonnage limits for Britain, the United States, and Japan, respectively. This resulted in the three treaty powers, the United States, Britain, and France, invoking the escalator clause after April 1937. Circulation of intelligence evidence in November 1937 of Japanese capital ships violating naval treaties caused the treaty powers to expand the escalator clause in June 1938, which amended the [[Displacement (ship)#Standard displacement|standard displacement]]{{refn|Standard displacement, also known as "Washington displacement", is a specific term defined by the Washington Naval Treaty of 1922. It is the displacement of the ship complete, fully manned, engined, and equipped ready for sea, including all armament and ammunition, equipment, outfit, provisions and fresh water for crew, miscellaneous stores, and implements of every description that are intended to be carried in war, but without fuel or reserve boiler feed water on board.<ref>''Conference on the Limitation of Armament, 1922''. Ch II, Part 4.</ref>|group=N}} limit of battleships from {{convert|35000|LT|-2}} to {{convert|45000|LT|-2}}.{{sfn|Friedman|1986|pp=307–309}}
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