1960 Treaty of Mutual Cooperation and Security

E38708

bilateral security treaty defense pact international treaty

The 1960 Treaty of Mutual Cooperation and Security is the foundational postwar defense pact between the United States and Japan that underpins their military alliance and the continued stationing of U.S. forces in Japan.

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All labels observed (11)

Label	Occurrences
U.S.–Japan Security Treaty	5
Treaty of Mutual Cooperation and Security between the United States and Japan	3
Japan–United States Security Treaty	2
1960 Treaty of Mutual Cooperation and Security canonical	1
1960 U.S.–Japan Security Treaty	1
Anpo Treaty	1
Japan–US Security Treaty	1
U.S.-Japan Security Treaty	1
U.S.-Japan Treaty of Mutual Cooperation and Security	1
U.S.-Japan security treaty	1
日米安全保障条約（1951年）	1

How this entity was disambiguated

This entity first appeared as the object of triple T293371 — 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: 1960 Treaty of Mutual Cooperation and Security
Context triple: [United States–Japan security alliance, legalBasis, 1960 Treaty of Mutual Cooperation and Security]

A. Joint Defence and Economic Co-operation Treaty of 1950
The Joint Defence and Economic Co-operation Treaty of 1950 is a foundational Arab League pact that established collective security and economic coordination among its member states in the early post–World War II era.
B. Treaty of Friendship, Cooperation and Mutual Assistance
The Treaty of Friendship, Cooperation and Mutual Assistance was the founding collective defense agreement that established the Warsaw Pact as the Eastern Bloc’s military alliance during the Cold War.
C. Mutual Defense Agreement (1958)
The Mutual Defense Agreement (1958) is a landmark Cold War-era treaty that deepened U.S.–UK strategic cooperation by enabling extensive collaboration on nuclear weapons and defense technology.
D. Anti-Ballistic Missile Treaty
The Anti-Ballistic Missile Treaty was a 1972 arms control agreement between the United States and the Soviet Union that limited missile defense systems to preserve the balance of nuclear deterrence during the Cold War.
E. Partial Nuclear Test Ban Treaty
The Partial Nuclear Test Ban Treaty is a 1963 international agreement that prohibited nuclear weapons tests in the atmosphere, outer space, and underwater, marking a key step in Cold War arms control and nuclear nonproliferation efforts.
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: 1960 Treaty of Mutual Cooperation and Security
Target entity description: The 1960 Treaty of Mutual Cooperation and Security is the foundational postwar defense pact between the United States and Japan that underpins their military alliance and the continued stationing of U.S. forces in Japan.

A. Joint Defence and Economic Co-operation Treaty of 1950
The Joint Defence and Economic Co-operation Treaty of 1950 is a foundational Arab League pact that established collective security and economic coordination among its member states in the early post–World War II era.
B. Treaty of Friendship, Cooperation and Mutual Assistance
The Treaty of Friendship, Cooperation and Mutual Assistance was the founding collective defense agreement that established the Warsaw Pact as the Eastern Bloc’s military alliance during the Cold War.
C. Mutual Defense Agreement (1958)
The Mutual Defense Agreement (1958) is a landmark Cold War-era treaty that deepened U.S.–UK strategic cooperation by enabling extensive collaboration on nuclear weapons and defense technology.
D. Anti-Ballistic Missile Treaty
The Anti-Ballistic Missile Treaty was a 1972 arms control agreement between the United States and the Soviet Union that limited missile defense systems to preserve the balance of nuclear deterrence during the Cold War.
E. Partial Nuclear Test Ban Treaty
The Partial Nuclear Test Ban Treaty is a 1963 international agreement that prohibited nuclear weapons tests in the atmosphere, outer space, and underwater, marking a key step in Cold War arms control and nuclear nonproliferation efforts.
F. None of above. chosen

Statements (46)

Predicate	Object
instanceOf	bilateral security treaty ⓘ defense pact ⓘ international treaty ⓘ
alsoKnownAs	1960 U.S.–Japan Security Treaty ⓘ linked to: 1960 Treaty of Mutual Cooperation and Security Anpo Treaty ⓘ linked to: 1960 Treaty of Mutual Cooperation and Security
containsProvision	consultation prior to major changes in U.S. forces in Japan ⓘ peaceful settlement of international disputes ⓘ respect for Japan’s sovereignty ⓘ
countryParty	Japan ⓘ United States ⓘ linked to: United States of America
domesticOppositionIn	Japan ⓘ
duration	indefinite ⓘ
entryIntoForceDate	1960-06-23 ⓘ
geopoliticalRole	cornerstone of U.S. security policy in East Asia ⓘ foundation of the postwar U.S.–Japan alliance ⓘ
historicalContext	Cold War ⓘ post–World War II U.S.–Japan relations ⓘ
inForce	true ⓘ
language	English ⓘ Japanese ⓘ
legalBasisFor	U.S. military bases in Japan ⓘ U.S.–Japan Status of Forces Agreement framework ⓘ linked to: U.S.–Japan Status of Forces Agreement
negotiatedBy	Government of Japan ⓘ United States Department of State ⓘ
obligationOf	Japan to provide bases and facilities to U.S. forces ⓘ United States defense of Japan in case of armed attack on territories under Japanese administration ⓘ
officialName	Treaty of Mutual Cooperation and Security between the United States and Japan ⓘ linked to: 1960 Treaty of Mutual Cooperation and Security
providesFor	consultation in the event of threats to Japan ⓘ continued presence of U.S. armed forces in Japan ⓘ mutual cooperation in defense matters ⓘ
region	Asia-Pacific ⓘ
relatedAgreement	U.S.–Japan Status of Forces Agreement ⓘ
relatedTo	Article 9 of the Constitution of Japan ⓘ Japan’s pacifist Constitution ⓘ linked to: Constitution of Japan
replaced	1951 U.S.–Japan Security Treaty ⓘ linked to: Treaty of San Francisco
securityArchitectureRole	pillar of the U.S. hub-and-spokes alliance system in Asia ⓘ
shortName	U.S.–Japan Security Treaty ⓘ linked to: 1960 Treaty of Mutual Cooperation and Security
signedAt	Washington, D.C. ⓘ
signedBy	Japanese Prime Minister Nobusuke Kishi ⓘ linked to: Nobusuke Kishi U.S. Secretary of State Christian A. Herter ⓘ
signingDate	1960-01-19 ⓘ
subject	U.S.–Japan military alliance ⓘ linked to: United States–Japan security alliance mutual defense ⓘ stationing of U.S. forces in Japan ⓘ
terminationClause	may be terminated by either party with one year’s notice after 10 years in force ⓘ
triggeredEvent	1960 Anpo protests in Japan ⓘ

How these facts were elicited

Referenced by (18)

Full triples — surface form annotated when it differs from this entity's canonical label.

United States–Japan security alliance → legalBasis → 1960 Treaty of Mutual Cooperation and Security ⓘ

Japan Socialist Party → opposed → Japan–US Security Treaty ⓘ