During the interwar period, the US Navy's battleship fleet was primarily composed of twelve "standard-type" battleships commissioned between 1916 and 1923, which were modernized in the 1930s. The Washington Naval Treaty of 1922 limited the construction of new battleships, causing several under-construction ships to be canceled, while others were modernized or assigned to secondary duties until the outbreak of World War II. Standard-type battleships The US Navy's battle line was comprised of twel