A model of USS Louisiana (BB-71).

USS Louisiana (BB-71) was the fifth and final Montana-class battleship planned for construction. She was to be named in honour of the 18th state and was assigned to the Norfolk Navy Yard that was preparing to lay her down at their shipyard at Portsmouth, Virginia. USS Louisiana would have been the third ship to bear that name had she been commissioned. By hull number, USS Louisiana was the last battleship authorized for construction for the United States Navy.

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