Japan Battleship
With the outbreak of World War I, Japan started designing battlecruisers. Between 1916 and 1918, about 20 variants of a preliminary draft project were developed. As a result of the Washington Naval Conference, the construction of battleships was canceled, but Japan was allowed to convert two battlecruisers into aircraft carriers. The conversion of Amagi commenced in 1923, but the hull on the stocks of Yokosuka was destroyed by the Great Kantō earthquake.