Question: Which U.S. Navy battleship was to be the second in its class but had its construction cancelled before the keel was laid?

full_context: Document 1: USS South Dakota (BB-57): USS "South Dakota" (BB-57) was a battleship in the United States Navy, in active service from 1942 until 1947. The lead ship of her class, "South Dakota" was the third ship of the US Navy to be named in honor of the 40th state. The four ships of the class are considered to be the most efficient battleships designed under the limitations of the Washington Naval Treaty. During World War II, the battleship first served a tour in the Pacific theater, where it fought in two battles in 1942 that earned the ship and its crew a Navy Unit Commendation before returning to New York in December 1942 for an overhaul and battle repairs. In May 1943, "South" "Dakota" joined British Home Fleet patrols in the North Atlantic and Arctic Oceans before sailing again to the Pacific in August 1943. There, "South Dakota" participated in combat operations preparatory to the invasion of Japan until returning to the United States in October 1945.
Document 2: 14&quot;/50 caliber gun: The 14"/50 caliber gun was a naval gun mounted on "New Mexico" and "Tennessee"-class battleship s. These ships also featured the first "three-gun" turrets, meaning that each gun in each turret could be "individually sleeved" to elevate separately (however, they could be linked so they would elevate as a unit, similar to the triple turrets on other Navy ships). The 14"/50 caliber guns were designated as Mark 4 and 6, with later versions known as Mark 7, 11, and B. These guns were more powerful than the main gun mounted on the previous three classes of US battleships (the "New York" , "Nevada" and "Pennsylvania" class es), the 14"/45 caliber gun.<ref name="14/50"> </ref>
Document 3: Lion-class battleship: The "Lion"-class battleships were a class of six fast battleships designed for the Royal Navy in the late 1930s. They were a larger, improved version of the "King George V" class with 16 in guns. Only two ships were laid down before the Second World War began in September 1939 and a third was ordered during the war, but their construction was suspended shortly afterwards. Their design changed several times in response to the removal of treaty restrictions on size and in light of war experience. None of the other ships planned were laid down, although there was a proposal to modify one of the suspended ships into a hybrid battleship/aircraft carrier with two 16-inch gun turrets and a flight deck. The two ships already begun were scrapped after the end of the war.
Document 4: USS Nevada (BB-36): USS "Nevada" (BB-36), the second United States Navy ship to be named after the 36th state, was the lead ship of the two "Nevada"-class battleship s. Launched in 1914, "Nevada" was a leap forward in dreadnought technology; four of her new features would be included on almost every subsequent US battleship: triple gun turrets, oil in place of coal for fuel, geared steam turbines for greater range, and the "all or nothing" armor principle. These features made "Nevada", alongside its sister ship "Oklahoma" , the first US Navy "super-dreadnoughts".
Document 5: Number 13-class battleship: The "Number 13"-class battleship was a planned class of four fast battleships to be built for the Imperial Japanese Navy (IJN) during the 1920s. The ships never received any names, being known only as "Numbers 13–16". They were intended to reinforce Japan's "eight-eight fleet" of eight battleships and eight battlecruisers after the United States announced a major naval construction program in 1919. The "Number 13" class was designed to be superior to all other existing battleships, planned or building. After the signing of the Washington Naval Treaty in 1922, they were cancelled in November 1923 before construction could begin.
Document 6: New York-class battleship: The "New York" class of battleship was a class of ships designed and constructed by the United States Navy between 1908 and 1914. The two ships of the class, "New York" and "Texas" , each saw extensive service beginning in the occupation of Veracruz, World War I, and World War II.
Document 7: USS Missouri (BB-63): USS "Missouri" (BB-63) ("Mighty Mo" or "Big Mo") is a United States Navy "Iowa"-class battleship and was the third ship of the U.S. Navy to be named after the U.S. state of Missouri. "Missouri" was the last battleship commissioned by the United States and is best remembered as the site of the surrender of the Empire of Japan which ended World War II.
Document 8: USS Illinois (BB-65): "Illinois" (BB-65) was an uncompleted battleship originally intended to be the first ship of the "Montana" class . However, the U.S. Navy's experiences in World War II led it to conclude that rather than more battleships larger and more heavily armed than the "Iowa" class , it needed more fast battleships of that class to escort the new "Essex"-class aircraft carrier s being built. As a result, hull BB-65 was reordered as an "Iowa"-class battleship midway through the war.
Document 9: South Dakota-class battleship (1920): The first "South Dakota" class was a class of six American battleships that were laid down in 1920 but never completed. They would have been the last dreadnoughts in the Naval Act of 1916 to be commissioned had the Washington Naval Treaty not caused their cancellation one-third of the way through their construction. They would have been the largest, most heavily armed and armored battleships in the U.S. Navy and, designed to achieve 23 kn , represented an attempt to abandon its 21 kn standardized fleet speed and catch up with the increasing fleet speeds of its main rivals, the British Royal Navy and Imperial Japanese Navy. In this, size and secondary armament, they represented a break from the Standard-type battleship that had dominated American capital ship design for the prior five ship classes, while their use of standardized bridges, lattice masts and other features was a continuation of this practice and the increase in the number of main guns from the preceding "Colorado" class had long been standard U.S. naval policy. The main restriction to which they had to adhere was the ability to pass through the Panama Canal.
Document 10: USS Kentucky (BB-66): USS "Kentucky" (BB-66) was an uncompleted battleship originally intended to be the second ship of the "Montana" class . However, the U.S. Navy's experiences in World War II led it to conclude that rather than more battleships larger and more heavily armed than the "Iowa" class , it needed more fast battleships of that class to escort the new "Essex"-class aircraft carrier s being built. As a result, hull BB-66 was reordered as an "Iowa"-class battleship midway through the war.
Document 11: USS Massachusetts (BB-59): USS "Massachusetts" (BB-59), known as "Big Mamie" to her crewmembers during World War II, was a battleship of the second "South Dakota" class. She was the seventh ship of the United States Navy to be named in honor of the sixth state, and one of two ships of her class (along with her sister "Alabama" ) to be donated for use as a museum ship. "Massachusetts" has the distinction of having fired the US Navy's first and last 16-in (406 mm) shells of the war.
Document 12: 16&quot;/45 caliber Mark 6 gun: The 16"/45 caliber Mark 6 gun is a naval gun designed in 1936 by the United States Navy for their Treaty battleships. It was first introduced in 1941 aboard their "North Carolina"-class battleship s, replacing the originally intended 14"/50 caliber Mark B guns and was also used for the follow-up "South Dakota" class. These battleships carried nine guns in three three-gun turrets. The gun was an improvement to the 16"/45 caliber guns used aboard the "Colorado" class , and the predecessor to the 16"/50 caliber Mark 7 gun used aboard the "Iowa" class .
Document 13: USS New Jersey (BB-62): USS "New Jersey" (BB-62) ("Big J" or "Black Dragon") is an "Iowa"-class battleship , and was the second ship of the United States Navy to be named after the US state of New Jersey. "New Jersey" earned more battle stars for combat actions than the other three completed "Iowa"-class battleships, and was the only US battleship providing gunfire support during the Vietnam War.
Document 14: Iowa-class battleship: The "Iowa"-class battleships were a class of six fast battleships ordered by the United States Navy in 1939 and 1940 to escort the Fast Carrier Task Forces that would operate in the Pacific Theater of World War II. Four were completed, two more were laid down but canceled in August 1945, at war's end, and both hulls were scrapped in 1958. Like other third-generation American battleships, the "Iowa"s followed the design pattern set forth in the preceding "North Carolina"-class and "South Dakota"-class battleships, which emphasized speed in addition to secondary and anti-aircraft batteries. Based on wartime experience, they were to serve as fast escorts for "Essex"-class aircraft carrier s.
Document 15: Montana-class battleship: The "Montana"-class battleships of the United States Navy were planned as successors to the "Iowa" class , being slower but larger, better armored, and having superior firepower. Five were approved for construction during World War II, but changes in wartime building priorities resulted in their cancellation in favor of the "Essex"-class aircraft carrier and "Iowa" class before any "Montana"-class keels were laid.
ground_truth: USS "Kentucky"