The battleship Iowa Built at Brooklyn Navy Yard between June 1940 and August 1942. 887 feet in length, it was the longest (if not heaviest) warship in the world when it was launched. Like the North Carolina, it was built on Shipways No.2, which had been totally reconstructed in a $2M PWA-WPA project lasting 14 months whose sole purpose was to allow construction of these enormous battleships[1]. They would be called Iowa-class ships, and besides the Iowa included the Missouri (also built at BNY), the New Jersey, and the Wisconsin.

1. Boro Yard Set to Lay Super-Battleship Keel, Brooklyn Daily Eagle, 25 May 1940, p.3. The PWA-WPA project to lengthen BNY's Shipways No.2 for the construction of the battleships North Carolina and Iowa.
2. Mightiest Warship is Launched Here, New York Times, 28 Aug 1942, pp.1,15: "...the 45,000-ton battleship Iowa, largest man-o'-war ever built ... Largely through the fforts of the ship workers and the Navy's engineers, the Iowa was launched seven months ahead of schedule and only two years and two months from the day her keel was laid, June 27, 1940 ... Mrs. Ilo Browne Wallace, wife of Vice President Henry A. Wallace, was the official sponsor of the Iowa ... With her on a platform that had been constructed beneath the overhanging, clipper-type bow [were] Mrs. Franklin D. Roosevelt, Mayor La Guardia, ... Naval officers said ... she was the largest warship ever launched anywhere, and that the deadwheight that went down the ways exceeded that of any ship ever launched, including such giant ocean liners as the Queen Mary and the Queen Elizabeth."
3. USS Iowa (BB-61), Wikipedia: history of the ship, including service in WWII.
4. Battleship Photo Archive: BB-61 USS Iowa, www.navsource.org, accessed 12 Jun 2018.
5. USS Iowa Museum at the Port of Los Angeles, California [website].