The New Mexico-class battleships were the backbone of American naval power during World War II.

Cultures · Published 10 October 2026 Swipe more like this →

In short: Built in the late 1910s, these three dreadnoughts evolved from experimental prototypes into combat-hardened veterans. From pioneering turbo-electric propulsion to surviving kamikaze attacks and testing the Navy's first anti-aircraft missiles, the New Mexico, Mississippi, and Idaho defined the standard-type battleship era before the rise of the aircraft carrier.

The New Mexico class, comprising the lead ship New Mexico, Mississippi, and Idaho, was designed to create a tactically homogeneous battle fleet. These ships were largely based on the preceding Pennsylvania class, retaining the twelve 14-inch/50 caliber main guns. However, they introduced significant refinements, including a clipper bow to improve seakeeping and a redesigned secondary battery layout that moved guns higher to remain usable in rough seas. New Mexico was uniquely fitted with an experimental turbo-electric propulsion system, while her sisters utilized geared turbines. Both systems were rated for a top speed of 21 knots, ensuring the fleet could operate as a unified force.

Throughout the 1920s and 1930s, the class served as a laboratory for naval doctrine. They participated in annual Fleet Problems—large-scale exercises that shaped Pacific War tactics—and pioneered long-range gunnery spotting using aircraft. By the 1930s, all three underwent extensive modernization, receiving anti-torpedo bulges, thicker deck armor, and new tower bridges. These upgrades increased their displacement significantly, yet the ships remained vital assets. When the United States entered World War II, their value was underscored by the fact that they were too critical to be removed from service for the extensive rebuilds required to modernize their conning towers, forcing the Navy to implement rolling upgrades instead.

The class saw intense action across the Pacific, supporting amphibious landings from the Aleutians to the Philippines. Mississippi notably participated in the Battle of Surigao Strait in October 1944, the final battleship engagement in history. Following the war, the ships were decommissioned, except for Mississippi. She was converted into a specialized gunnery training vessel, serving as a platform for testing anti-aircraft missiles like the RIM-2 Terrier and the radar-homing Petrel. By the time she was sold for scrap in 1956, she had bridged the gap between the age of the dreadnought and the dawn of the missile era.

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