How a Treaty Loophole Created the Most Successful Battleship of the Pacific War

Cultures · Published 3 October 2026 Swipe more like this →

In short: Designed under strict international naval treaties, the USS North Carolina was initially limited to 14-inch guns. However, a clever diplomatic maneuver allowed the United States to upgrade her to a 16-inch main battery, transforming her into a formidable fast battleship that became a vital shield for American aircraft carriers.

Laid down in 1937, the USS North Carolina (BB-55) was the first fast battleship built for the United States Navy. Her development was constrained by the Washington Naval Treaty system, which imposed strict limits on displacement and armament. While the Second London Naval Treaty of 1936 initially capped her main guns at 14 inches, the United States invoked an escalator clause after Japan refused to sign the treaty, permitting the installation of nine 16-inch guns in triple turrets.

Commissioned in April 1941, the ship became a workhorse of the Pacific War. She spent much of her career screening aircraft carriers, including the Enterprise and Saratoga, during critical campaigns from Guadalcanal to the final assaults on Japan. Her anti-aircraft capabilities were constantly upgraded, evolving from a modest initial battery to a massive array of 60 Bofors guns by late 1943. Despite being torpedoed by the Japanese submarine I-19 in September 1942, she remained operational, proving more successful and less cramped than the heavier-armored South Dakota class.

The North Carolina's service record was marked by intense combat, including the Battle of the Eastern Solomons and the Battle of the Philippine Sea. She provided essential fire support during the invasions of Iwo Jima and Okinawa in 1945. Following the war, she participated in Operation Magic Carpet to bring American personnel home. Decommissioned in 1947, she was saved from the scrapyard by a grassroots preservation campaign and opened as a museum ship in Wilmington, North Carolina, in 1962.

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