Question: In what year was the US naval gun designed for the battleships to help Argentina counter Brazil's two "Minas Geraes"- class battleships?

full_context: Document 1: 14&quot;/45 caliber gun: The 14"/45 caliber gun, (spoken "fourteen-inch-forty-five-caliber"), whose variations were known initially as the Mark 1, 2, 3, and 5, and later as the Mark 8, 9, 10, and 12, were the first 14 in guns to be employed with the United States Navy, and were for over a year the most powerful naval ordnance afloat. They were installed aboard the United States Navy's "New York"-class , "Nevada"-class , and "Pennsylvania"-class battleship s as the primary armament for each battleship in the class. The gun also saw service in the British Royal Navy, where it was designated the BL 14 inch gun Mk II.
Document 2: 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 3: 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 4: Rivadavia-class battleship: The "Rivadavia" class consisted of two battleships designed by the American Fore River Shipbuilding Company for the Argentine Navy. Named "Rivadavia" and "Moreno" after important figures in Argentine history, they were Argentina's entry in the South American dreadnought race and a counter to Brazil's two "Minas Geraes"-class battleship s.
Document 5: 8&quot;/35 caliber gun: The 8"/35 caliber gun Mark 3 and Mark 4 (spoken "eight-inch-thirty-five--caliber") were used for the main batteries of the United States Navy's first armored cruisers and the secondary batteries for their first battleships, the "Indiana"-class . The 8"/40 caliber gun Mark 5 initially armed the "Pennsylvania"-class armored cruisers.
Document 6: Brazilian battleship Minas Geraes: Minas Geraes, spelled Minas Gerais in some sources, was a dreadnought battleship of the Brazilian Navy. Named in honor of the state of Minas Gerais, the ship was laid down in April 1907 as the lead ship of its class, making the country the third to have a dreadnought under construction and igniting a naval arms race between Brazil, Argentina, and Chile.
Document 7: 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 8: Revenge-class battleship: The Revenge"-class battleships (listed as Royal Sovereign" class in several editions of "Jane's Fighting Ships", as with the 1919 and 1931 editions, and sometimes also known as the "R" class) were five battleships of the Royal Navy, ordered as the First World War loomed, and launched in 1914–16. There were originally to have been eight of the class, but two were later redesigned, becoming the "Renown"-class battlecruiser s, while the other, which was to have been named HMS "Resistance", was cancelled.
Document 9: Erzherzog Karl-class battleship: The "Erzherzog Karl" class was a class of pre-dreadnought battleships of the Austro-Hungarian Navy built before World War I. All of the battleships of the "Erzherzog Karl"-class were built in the Stabilimento Tecnico Triestino shipyards in Trieste. The first battleship, "Erzherzog Karl" was laid down in 1902. Construction on the remaining two battleships, "Erzherzog Ferdinand Max" and "Erzherzog Friedrich" continued up to 1905. "Erzherzog Karl" was commissioned in 1906, while "Erzherzog Ferdinand Max" and "Erzherzog Friedrich" were commissioned in 1907. The three "Erzherzog Karl"-class battleships were considered relatively modern by the time they were commissioned. However, small docking space and budget restraints resulted in the class being fairly compact. Nevertheless, they were well designed and properly protected. The "Erzherzog Karl" class were the last and largest pre-dreadnoughts built by the Austrian Navy. They were named after members of the Austrian Royal family.
Document 10: Minas Geraes-class battleship: The "Minas Geraes" class, spelled "Minas Gerais" in some sources, consisted of two battleships built for the Brazilian Navy in the early twentieth century. Named "Minas Geraes" and "São Paulo" , the ships were intended to be Brazil's first step towards becoming an international power, and they consequently initiated a South American naval arms race.
Document 11: 16&quot;/45 caliber gun: The 16"/45 caliber gun (spoken "sixteen-inch-forty-five-caliber") was used for the primary batteries of the last class of Standard-type battleships for the United States Navy, the "Colorado"-class . These guns promised twice the muzzle energy over the Mark 7 12-inch/50 caliber guns of the "Wyoming"-class battleship and a 50% increase over the 14-inch/45 caliber guns of the "New York"-class , "Nevada"-class , and "Pennsylvania"-class battleship s.
Document 12: 10&quot;/31 caliber gun: The 10"/31 caliber gun Mark 1 Mod 1 (spoken "ten-inch-thirty-one--caliber") and the 10"/35 caliber gun Mark 1 Mod 2 were both used for the primary batteries of the United States Navy's "Amphitrite"-class monitor "Miantonomoh" . The 10"/30 caliber gun Mark 2 was used as main armament on the remaining Amphitrite-class monitors, the monitor "Monterey" , and the armored cruiser "Maine" .
Document 13: 13&quot;/35 caliber gun: The 13"/35 caliber gun Mark 1 (spoken "thirteen-inch-thirty-five-caliber") was used for the primary batteries on eight of the first nine battleships in the United States Navy, "Indiana"-class , "Kearsarge"-class and "Illinois"-class ;  used the 12 in /35 caliber gun.
Document 14: List of battleships of Italy: Starting in the 1890s, the Italian "Regia Marina" (Royal Navy) began building a series of modern battleships. Early designs were marked by their small size, light armor, and high speed compared to contemporary foreign counterparts. The first pre-dreadnought battleship design, the "Ammiraglio di Saint Bon" class , was constrained by budgetary limits imposed by the legislature. Two ships were ordered by the class's namesake, Admiral Simone de Pacoret Saint Bon, though the design was also influenced by Benedetto Brin, who replaced di Saint Bon as naval minister after his death. Brin designed the next pair of battleships, the "Regina Margherita" class . These ships were larger than the preceding class, and were intended to challenge the Austro-Hungarian "Habsburg"-class battleship s then under construction. Brin himself died during the construction process. Vittorio Cuniberti designed the next class of small pre-dreadnoughts, the "Regina Elena" class , which were the fastest battleships in the world at the time of their completion. These ships all served in the Italo-Turkish War of 1911–12, where they were primarily used to provide naval gunfire support for the Italian ground troops, as the Ottoman Navy largely confined itself to port.
Document 15: 12&quot;/50 caliber gun (Argentina): The 12"/50 caliber "Bethlehem" gun was a US naval gun designed in 1910 as the main armament for the Argentine Navy’s dreadnought battleships of the "Rivadavia" class .
ground_truth: 1910