The Washington Naval Treaty, signed in 1922, was an agreement among major world powers to limit naval armaments after World War I. It aimed to prevent an arms race by capping the number of warships each country could build, focusing on battleships and aircraft carriers. The treaty involved the United States, the United Kingdom, Japan, France, and Italy. The treaty established a ratio for naval tonnage, with the U.S. and the U.K. allowed the largest fleets, followed by Japan, France, and Italy. This agreement marked a significant effort in international diplomacy to promote peace and stability in the post-war era.