The Colorado-class battleships were a class of three battleships built for the United States Navy after World War I. Four vessels were originally planned, but only three were actually completed The fourth ship, USS Washington (BB-48) was cancelled under the terms of the Washington Naval Disarmament Treaty of 1922 when she was near completion. As such, the Colorado-class ships were the last and most powerful battleships built by the US Navy until the North Carolina-class battleships were commissioned on the eve of World War II.