US–UK MDA
E43382
The US–UK MDA is a landmark 1958 nuclear cooperation treaty under which the United States and the United Kingdom share nuclear weapons technology, materials, and information for mutual defense purposes.
All labels observed (1)
| Label | Occurrences |
|---|---|
| US–UK MDA canonical | 2 |
How this entity was disambiguated
This entity first appeared as the object of triple T342778 — 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: US–UK MDA Context triple: [Mutual Defense Agreement (1958), shortName, US–UK MDA]
-
A.
UKUSA Agreement
The UKUSA Agreement is a post-World War II multilateral intelligence-sharing pact, originally between the US and UK, that underpins the global signals intelligence alliance now known as the Five Eyes.
-
B.
US–UK Bilateral Working Groups
The US–UK Bilateral Working Groups are joint forums where the United States and United Kingdom coordinate on specific policy areas to strengthen and manage their close diplomatic, security, and economic relationship.
-
C.
Five Eyes alliance
The Five Eyes alliance is an intelligence-sharing partnership among the United States, United Kingdom, Canada, Australia, and New Zealand that coordinates extensive signals intelligence and surveillance activities.
-
D.
Headquarters Agreement between the United Nations and the United States
The Headquarters Agreement between the United Nations and the United States is the treaty that establishes the legal status, privileges, and obligations governing the UN’s presence and operations at its main headquarters in New York City.
-
E.
Anglo-American intelligence cooperation
Anglo-American intelligence cooperation refers to the close, often secret wartime and postwar collaboration in espionage, codebreaking, and security coordination between the United States and the United Kingdom.
- 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: US–UK MDA Target entity description: The US–UK MDA is a landmark 1958 nuclear cooperation treaty under which the United States and the United Kingdom share nuclear weapons technology, materials, and information for mutual defense purposes.
-
A.
UKUSA Agreement
The UKUSA Agreement is a post-World War II multilateral intelligence-sharing pact, originally between the US and UK, that underpins the global signals intelligence alliance now known as the Five Eyes.
-
B.
US–UK Bilateral Working Groups
The US–UK Bilateral Working Groups are joint forums where the United States and United Kingdom coordinate on specific policy areas to strengthen and manage their close diplomatic, security, and economic relationship.
-
C.
Five Eyes alliance
The Five Eyes alliance is an intelligence-sharing partnership among the United States, United Kingdom, Canada, Australia, and New Zealand that coordinates extensive signals intelligence and surveillance activities.
-
D.
Headquarters Agreement between the United Nations and the United States
The Headquarters Agreement between the United Nations and the United States is the treaty that establishes the legal status, privileges, and obligations governing the UN’s presence and operations at its main headquarters in New York City.
-
E.
Anglo-American intelligence cooperation
Anglo-American intelligence cooperation refers to the close, often secret wartime and postwar collaboration in espionage, codebreaking, and security coordination between the United States and the United Kingdom.
- F. None of above. chosen
Statements (51)
| Predicate | Object |
|---|---|
| instanceOf |
bilateral treaty
ⓘ
defence agreement ⓘ nuclear cooperation agreement ⓘ |
| allows |
cooperation on nuclear reactor technology for naval propulsion
ⓘ
joint development and exchange of nuclear warhead design information ⓘ transfer of classified nuclear weapons information from the United States to the United Kingdom ⓘ transfer of special nuclear material for defence purposes ⓘ |
| countryParty |
United Kingdom
ⓘ
United States ⓘ
linked to:
United States of America
|
| dateSigned | 1958-07-03 ⓘ |
| enteredIntoForce | 1958-08-04 ⓘ |
| extendedBy |
1963 amendment
ⓘ
1968 amendment ⓘ 1974 amendment ⓘ 1984 amendment ⓘ 1994 amendment ⓘ 2004 amendment ⓘ 2014 amendment ⓘ |
| field |
arms control and disarmament
ⓘ
international security ⓘ |
| fullName | Agreement between the Government of the United States of America and the Government of the United Kingdom of Great Britain and Northern Ireland for Cooperation on the Uses of Atomic Energy for Mutual Defence Purposes ⓘ |
| hasProvision |
cooperation in the development of defence plans involving nuclear weapons
ⓘ
exchange of information on nuclear reactor design for military purposes ⓘ exchange of information on nuclear weapon design, development and fabrication ⓘ transfer of special nuclear material for research, development and training ⓘ |
| influenced |
development of the UK Polaris missile programme
ⓘ
development of the UK Trident nuclear weapons system ⓘ |
| language | English ⓘ |
| legalBasis |
United States Atomic Energy Act of 1954 (as amended)
ⓘ
linked to:
Atomic Energy Act of 1954
|
| predecessor |
1948 US–UK Modus Vivendi on atomic energy cooperation
ⓘ
Quebec Agreement ⓘ |
| purpose |
cooperation on the uses of atomic energy for mutual defence purposes
ⓘ
sharing of nuclear materials and information for defence ⓘ sharing of nuclear weapons technology between the United States and the United Kingdom ⓘ |
| relatedTo |
NATO nuclear policy
ⓘ
linked to:
NATO military doctrine
US–UK special relationship ⓘ
linked to:
Anglo-American relations
United Kingdom nuclear weapons programme ⓘ
linked to:
Nuclear weapons policy of the United Kingdom
United States nuclear weapons programme ⓘ
linked to:
U.S. thermonuclear weapons program
|
| renewalInterval | 10 years ⓘ |
| renewalRequired | yes ⓘ |
| shortName |
US–UK MDA
ⓘ
US–UK Mutual Defence Agreement ⓘ
linked to:
Mutual Defense Agreement (1958)
|
| signatory |
Government of the United Kingdom of Great Britain and Northern Ireland
ⓘ
linked to:
UK government
Government of the United States of America ⓘ
linked to:
United States government
|
| status | in force ⓘ |
| subjectArea |
military cooperation
ⓘ
mutual defence ⓘ nuclear materials ⓘ nuclear technology ⓘ nuclear weapons ⓘ |
| yearSigned | 1958 ⓘ |
How these facts were elicited
The pipeline generated the facts above by prompting gpt-5.1 with this entity's name + description and the instruction below.
Instruction
You are a knowledge base construction expert. Given a subject entity and a description of it, return factual statements that you know for the subject as a JSON list of dictionaries(triples), where keys must be "subject", "predicate" and "object". The number of facts may be very high, between 25 to 50 or more, for very popular subjects. For less popular subjects, the number of facts can be very low, like 5 or 10. # Requirements - If you don't know the subject at all, return an empty list. - If the subject is not a named entity, return an empty list. - Include at least one triple where predicate is "instanceOf". - Do not get too wordy. - Separate several objects into multiple triples with one object.
Input
Subject: US–UK MDA Description of subject: The US–UK MDA is a landmark 1958 nuclear cooperation treaty under which the United States and the United Kingdom share nuclear weapons technology, materials, and information for mutual defense purposes.
Referenced by (2)
Full triples — surface form annotated when it differs from this entity's canonical label.