TheFour-Power Treaty (四カ国条約,Shi-ka-koku Jōyaku) was a treaty signed by theUnited States,Great Britain,France andJapan at theWashington Naval Conference on 13 December 1921. It was partly a follow-up to theLansing-Ishii Treaty, signed between the U.S. and Japan.^[1] This Treaty related tothe Treaty for the Limitation of Naval Armament that attempted to maintain peace in the Pacific. It was signed inWashington, D.C., on 13 December 1921.

By the Four-Power Treaty, all parties agreed to maintain the status quo in the Pacific by respecting the Pacific territories of the other countries, signing the agreement, not seeking further territorial expansion, and mutual consultation with each other in the event of a dispute over territorial possessions. However, the main result of the Four-Power Treaty was the termination of theAnglo-Japanese Alliance of 1902.^[2][3]

The powers agreed to respect each other’s Pacific island dependencies for ten years.^[4]

• Ian H. Nish,The Anglo-Japanese Alliance: The Diplomacy of Two Island Empires 1894–1907, The Athlone Press, London and Dover NH, first published 1966.
• J. Chal Vinson, "The Drafting of the Four-Power Treaty of the Washington Conference,"Journal of Modern History 25#1 (Mar., 1953), pp. 40–47online.

• The full text of the Four-Power Treaty

• Treaties of the United States
• 1921 in the United States
• 1921 in the United Kingdom
• 1921 in France
• 1921 in Japan
• 1921 treaties
• Interwar-period treaties
• Treaties concluded in 1921
• Treaties of the Empire of Japan
• United Kingdom–United States treaties

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