Which agreement aimed to limit naval armaments among leading powers?

The Washington Conference, held from 1921 to 1922, was a significant diplomatic gathering that involved major naval powers, including the United States, the United Kingdom, Japan, France, and Italy. The primary aim of the conference was to address naval disarmament and prevent an arms race following World War I.

The result was several treaties that established limitations on naval armaments, most notably the Five-Power Treaty, which set caps on the tonnage of warships that each of the signatory powers could possess. This agreement sought to stabilize relations and promote peace by reducing the potential for military conflict through disarmament. The success of the Washington Conference in reaching agreements regarding naval arms marked a pivotal moment in early 20th-century diplomatic efforts toward collective security and arms control.

In contrast, the other agreements listed do not primarily focus on limiting naval armaments. The Kellogg-Briand Pact was aimed at outlawing war altogether, while the Locarno Treaties focused on maintaining the post-World War I territorial settlements in Europe. The Young Plan was concerned with the management of Germany's reparations payments following the war.