Arizona had barely been in the union for two years when the keel was laid on battleship 39 (BB-39) at the Brooklyn Navy Yard, named after the 48th state. In attendance was Assistant Secretary of the Navy Franklin D. Roosevelt.
Battleships were the premier capital ships of any navy and had been revolutionized by the 1906 launch of the Royal Navy's HMS Dreadnought, the first all-big-gun ship. It lost the smaller-caliber weapons of its predecessors in favor of batteries of deadly 12-inch guns that could hurl shells for miles. The ship took its name from Queen Elizabeth I's saying, "I will trust in God and dread nought." This gave the name to all classes of future battleships.
Arizona, according to the New York Times, would be "the world's biggest and most powerful, both offensively and defensively, superdreadnought ever constructed." It was armed with three batteries of three 14-inch big guns each, with a range of 12 miles. The armor belt at its widest (made by Krupp) measured 13.5 inches; the deck was also armored. She was 608 feet long and displaced nearly 30,000 tons, becoming at the time the largest ship in the fleet (today’s new Gerald R. Ford carrier is 100,000 tons and more than 1,000 feet long).
Arizona was launched in 15 months with 75,000 people in attendance, including the state's governor, George W.P. Hunt. Esther Ross of Prescott christened her with two bottles, one of sparking wine and another of water from Theodore Roosevelt Lake (the state had recently passed prohibition).