United States–Japan security alliance

E6041

bilateral security alliance defense partnership military alliance

The United States–Japan security alliance is a post–World War II defense partnership under which the U.S. guarantees Japan’s security and maintains military forces in and around Japan, forming a cornerstone of security architecture in the Asia-Pacific region.

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All labels observed (36)

Label	Occurrences
United States–Japan security alliance canonical	10
U.S.–Japan security alliance	9
Japan–United States alliance	6
Treaty of Mutual Cooperation and Security between the United States and Japan	4
U.S.–Japan Security Treaty	4
U.S.–Japan alliance	4
Japan–United States security alliance	3
United States–Japan alliance	3
Japan–United States relations	2
U.S.-Japan security alliance	2
U.S.-Japan security treaty	2
U.S.–Japan military alliance	2
US–Japan alliance	2
1951 U.S.–Japan Security Treaty	1
1997 Guidelines for U.S.–Japan Defense Cooperation	1
2015 Guidelines for U.S.–Japan Defense Cooperation	1
Japan-U.S. security alliance	1
Japan–U.S. Security Treaty	1
Japan–U.S. security alliance	1
Japan–US security facilities network	1
Japan–United States Security Treaty	1
Japan–United States Security Treaty (as territories under Japanese administration)	1
Japan–United States security alliance infrastructure	1
Japan–United States security arrangements	1
U.S.-Japan alliance	1
U.S.-Japan security alliance framework	1
U.S.–Japan Alliance	1
U.S.–Japan security alliance infrastructure	1
U.S.–Japan security framework	1
US–Japan relations	1
US–Japan security alliance	1
US–Japan security alliance infrastructure	1
US–Japan security arrangements	1
United States–Japan security arrangements	1
postwar U.S.–Japan alliance	1
新日米安全保障条約	1

How this entity was disambiguated

This entity first appeared as the object of triple T27631 — resolving that mention is where its identity was fixed. The disambiguator weighed these candidate entities and picked the highlighted one (or “None”, minting a new entity). This is how homonymy is resolved: the same surface form can point to different entities.

NED1 Entity disambiguation (via context triple) gpt-5-mini-2025-08-07

Target entity: United States–Japan security alliance
Context triple: [United States Navy, allianceMember, United States–Japan security alliance]

A. ANZUS
ANZUS is a security pact formed in 1951 between Australia, New Zealand, and the United States to promote mutual defense and military cooperation in the Pacific region.
B. North Atlantic Treaty
The North Atlantic Treaty is the 1949 founding agreement that created the NATO military alliance, establishing collective defense commitments among Western nations during the early Cold War.
C. Anglo-American relations
Anglo-American relations refers to the historical, political, and cultural relationship between the United Kingdom and the United States, encompassing their diplomatic ties, alliances, and mutual influences over time.
D. NATO
NATO is a political and military alliance of North American and European countries formed for collective defense and security cooperation.
E. Truman Doctrine
The Truman Doctrine was a U.S. foreign policy announced in 1947 that committed the United States to providing political, military, and economic assistance to countries threatened by communism, marking the start of the Cold War containment strategy.
F. None of above. chosen
G. Unsure - the case is ambiguous/there is not enough information to decide.

NED2 Entity disambiguation (via description) gpt-5-mini-2025-08-07

Target entity: United States–Japan security alliance
Target entity description: The United States–Japan security alliance is a post–World War II defense partnership under which the U.S. guarantees Japan’s security and maintains military forces in and around Japan, forming a cornerstone of security architecture in the Asia-Pacific region.

A. ANZUS
ANZUS is a security pact formed in 1951 between Australia, New Zealand, and the United States to promote mutual defense and military cooperation in the Pacific region.
B. North Atlantic Treaty
The North Atlantic Treaty is the 1949 founding agreement that created the NATO military alliance, establishing collective defense commitments among Western nations during the early Cold War.
C. Anglo-American relations
Anglo-American relations refers to the historical, political, and cultural relationship between the United Kingdom and the United States, encompassing their diplomatic ties, alliances, and mutual influences over time.
D. NATO
NATO is a political and military alliance of North American and European countries formed for collective defense and security cooperation.
E. Atlantic Charter agreement
The Atlantic Charter agreement was a pivotal 1941 joint declaration by the United States and the United Kingdom that outlined shared war aims and principles for the post–World War II international order, including self-determination, free trade, and collective security.
F. None of above. chosen

Statements (48)

Predicate	Object
instanceOf	bilateral security alliance ⓘ defense partnership ⓘ military alliance ⓘ
allows	stationing of United States Armed Forces in Japan ⓘ
alsoKnownAs	Japan–U.S. security alliance ⓘ linked to: United States–Japan security alliance U.S.–Japan alliance ⓘ linked to: United States–Japan security alliance U.S.–Japan security alliance ⓘ linked to: United States–Japan security alliance
basedOnTreaty	Treaty of Mutual Cooperation and Security between the United States and Japan ⓘ linked to: United States–Japan security alliance
component	U.S. Forces Japan ⓘ U.S. military bases in Okinawa Prefecture ⓘ United States Seventh Fleet presence around Japan ⓘ bilateral defense guidelines ⓘ bilateral joint military exercises ⓘ bilateral security consultations ⓘ
coreObligationOfJapan	provide bases and facilities for U.S. forces in Japan ⓘ
coreObligationOfUnitedStates	defend Japan if it is attacked ⓘ
country1	United States ⓘ linked to: United States of America
country2	Japan ⓘ
focusArea	deterrence against nuclear and conventional threats in Northeast Asia ⓘ maritime security in the Western Pacific ⓘ protection of sea lanes of communication ⓘ
hasControversy	domestic opposition in Japan to U.S. bases, especially in Okinawa ⓘ
headquartersLocation	Tokyo ⓘ
includes	extended deterrence commitments by the United States ⓘ
influencedBy	Article 9 of the Constitution of Japan ⓘ
involves	collective self-defense arrangements limited by Japan’s constitution ⓘ
keyPartnerInstitution	Japan Ministry of Defense ⓘ Japan Self-Defense Forces ⓘ United States Department of Defense ⓘ linked to: Department of Defense
legalBasis	1951 U.S.–Japan Security Treaty ⓘ linked to: United States–Japan security alliance 1960 Treaty of Mutual Cooperation and Security ⓘ
politicalSignificance	framework for U.S.–Japan strategic cooperation ⓘ symbol of the U.S.–Japan partnership ⓘ
purpose	deter aggression against Japan ⓘ guarantee Japan’s security ⓘ maintain peace and stability in the Asia-Pacific region ⓘ support regional security architecture ⓘ
region	Asia-Pacific ⓘ Indo-Pacific ⓘ linked to: Asia-Pacific
relatedTo	ANZUS alliance ⓘ linked to: ANZUS U.S. security presence in the Western Pacific ⓘ U.S.–South Korea alliance ⓘ linked to: United States–South Korea security alliance
securityArchitectureRole	cornerstone of U.S. security strategy in East Asia ⓘ pillar of the regional hub-and-spokes alliance system ⓘ
significantEvent	1960 revision of the U.S.–Japan Security Treaty ⓘ
startTime	1951 ⓘ
updatedBy	1997 Guidelines for U.S.–Japan Defense Cooperation ⓘ linked to: United States–Japan security alliance 2015 Guidelines for U.S.–Japan Defense Cooperation ⓘ linked to: United States–Japan security alliance

How these facts were elicited