USS Pennsylvania (BB-38) was the lead ship of the Pennsylvania class of super-dreadnought battleships built for the United States Navy in the 1910s. The Pennsylvanias were part of the standard-type battleship series, and marked an incremental improvement over the preceding Nevada class, carrying an extra pair of 14-inch (356 mm) guns for a total of twelve guns. Named for the Commonwealth of Pennsylvania, she was laid down at the Newport News Shipbuilding and Drydock Company in October 1913, was launched in March 1915, and was commissioned in June 1916. Equipped with an oil-burning propulsion system, Pennsylvania was not sent to European waters during World War I, since the necessary fuel oil was not as readily available as coal. Instead, she remained in American waters and took part in training exercises; in 1918, she escorted President Woodrow Wilson to France to take part in peace negotiations. wiki