The Iowa class battleships were similar to the South Dakota class but made longer to have higher speed, to be with the fast carrier task forces, and could carry a larger 16" gun.
The cost to build each of the Iowa class was more than $100 million each.
The United States invoked a clause from the 1936 London Treaty that would allow them to build a 45,000 ton battleship. Design work started in 1937 to counter Japanese designs.
The Iowa class battleships had two catapults to launch their floatplanes.
The 16" guns could fire a 2,700 lb AP shell 42,000 yards. Well trained gun crews could fire 2 rounds per minute.
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