The United States Navy built two Tennessee-class battleships:
Tennessee and her sister ship California were the first American battleships built to a "post-Jutland" hull design. As a result of extensive experimentation and testing, her underwater hull protection was much greater than that of previous battleships; and both her main and secondary batteries had fire-control systems. The Tennessee class, and the three ships of the Colorado class which followed, were identified by two heavy cage masts supporting large fire-control tops. This feature was to distinguish the "Big Five" from the rest of the battleship force until World War II. Since Tennessee's 14-inch turret guns could be elevated to 30 degrees - rather than to the 15 degrees of earlier battleships - her heavy guns could reach out an additional 10,000 yards. Because battleships were then beginning to carry airplanes to spot long-range gunfire, Tennessee's ability to shoot "over the horizon" had a practical value.
The Tennessee class was part of the "Standard type battleship" concept of the US Navy, a design concept which gave the US Navy a homogenous line of battle (very important, as it allowed the Navy to plan maneuvers for the whole line of battle rather than detaching "fast wing"s and "slow wing"s). The "Standard" concept included long-range gunnery, moderate speed (21 knots), a tight tactical radius (~700 yards) and improved damage control. The other Standards were the Nevada, Pennsylvania, New Mexico and Colorado classes.
