McMahon Act
E23840
The McMahon Act is a landmark 1946 U.S. law that established civilian control over nuclear energy and restricted the sharing of atomic information, laying the foundation for American nuclear policy during the early Cold War.
All labels observed (2)
| Label | Occurrences |
|---|---|
| McMahon Act canonical | 2 |
| McMahon Act amendments | 1 |
How this entity was disambiguated
This entity first appeared as the object of triple T186795 — 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: McMahon Act Context triple: [Atomic Energy Act of 1946, shortName, McMahon Act]
-
A.
Canberra Agreement
The Canberra Agreement is the 1947 treaty that established the Pacific Community, a regional organization for cooperation and development among Pacific Island countries and territories.
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B.
Statute of Westminster 1931
The Statute of Westminster 1931 is a landmark British law that granted full legislative independence to the self-governing Dominions of the British Empire, laying the constitutional foundation for the modern Commonwealth realms and redefining the role of the British monarch within them.
-
C.
Government of Ireland Act 1920
The Government of Ireland Act 1920 was a British law that partitioned Ireland and established separate home rule parliaments for Northern Ireland and Southern Ireland.
-
D.
Anglo-Irish Treaty
The Anglo-Irish Treaty was the 1921 agreement between Britain and Irish representatives that ended the War of Independence and established the Irish Free State as a self-governing dominion within the British Empire.
-
E.
National Agreement of 1903
The National Agreement of 1903 was a landmark pact between the National and American Leagues that formally established peace, recognized each other’s major league status, and created a unified structure for professional baseball in the United States.
- 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: McMahon Act Target entity description: The McMahon Act is a landmark 1946 U.S. law that established civilian control over nuclear energy and restricted the sharing of atomic information, laying the foundation for American nuclear policy during the early Cold War.
-
A.
Canberra Agreement
The Canberra Agreement is the 1947 treaty that established the Pacific Community, a regional organization for cooperation and development among Pacific Island countries and territories.
-
B.
Statute of Westminster 1931
The Statute of Westminster 1931 is a landmark British law that granted full legislative independence to the self-governing Dominions of the British Empire, laying the constitutional foundation for the modern Commonwealth realms and redefining the role of the British monarch within them.
-
C.
Government of Ireland Act 1920
The Government of Ireland Act 1920 was a British law that partitioned Ireland and established separate home rule parliaments for Northern Ireland and Southern Ireland.
-
D.
Anglo-Irish Treaty
The Anglo-Irish Treaty was the 1921 agreement between Britain and Irish representatives that ended the War of Independence and established the Irish Free State as a self-governing dominion within the British Empire.
-
E.
National Agreement of 1903
The National Agreement of 1903 was a landmark pact between the National and American Leagues that formally established peace, recognized each other’s major league status, and created a unified structure for professional baseball in the United States.
- F. None of above. chosen
Statements (47)
| Predicate | Object |
|---|---|
| instanceOf |
United States federal law
ⓘ
atomic energy legislation ⓘ nuclear energy law ⓘ |
| appliesTo |
nuclear materials production information
ⓘ
nuclear reactor technology information ⓘ nuclear weapons design information ⓘ |
| chamberOfOrigin | United States Senate ⓘ |
| classificationSystem |
formerly restricted data
ⓘ
restricted data ⓘ |
| codifiedIn | Public Law 79-585 ⓘ |
| country | United States of America ⓘ |
| createdAgency | United States Atomic Energy Commission ⓘ |
| dateEnacted | 1946-08-01 ⓘ |
| effect |
limited nuclear cooperation with Canada
ⓘ
limited nuclear cooperation with the United Kingdom ⓘ |
| era | early Cold War ⓘ |
| established | civilian control of nuclear energy in the United States ⓘ |
| governs |
development of nuclear weapons in the United States
ⓘ
peacetime use of atomic energy in the United States ⓘ |
| historicalSignificance |
foundation of early U.S. nuclear policy
ⓘ
shifted control of atomic energy from the military to civilians ⓘ |
| introducedConcept | restricted data (U.S. nuclear information classification) ⓘ |
| jurisdiction |
United States government
ⓘ
surface form:
federal government of the United States
|
| legislativeBody | United States Congress ⓘ |
| locationOfSigning | Washington, D.C. ⓘ |
| namedAfter | Brien McMahon ⓘ |
| objective |
ensure national security in the control of atomic energy
ⓘ
promote civilian oversight of nuclear technology ⓘ |
| officialName | Atomic Energy Act of 1946 ⓘ |
| policyArea |
defense policy
ⓘ
nuclear nonproliferation ⓘ science and technology policy ⓘ |
| relatedTo |
Atomic Energy Act of 1954
ⓘ
Manhattan Project ⓘ U.S.–UK nuclear relations ⓘ United States Atomic Energy Commission ⓘ |
| replaced | wartime military control of atomic energy in the United States ⓘ |
| restricted |
dissemination of restricted data
ⓘ
sharing of atomic information with foreign countries ⓘ |
| signedBy |
President Harry S. Truman
ⓘ
surface form:
Harry S. Truman
|
| sponsor | Brien McMahon ⓘ |
| subjectMatter |
atomic weapons
ⓘ
control of atomic information ⓘ national security ⓘ nuclear energy ⓘ |
| supersededBy | Atomic Energy Act of 1954 ⓘ |
| yearEnacted | 1946 ⓘ |
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: McMahon Act Description of subject: The McMahon Act is a landmark 1946 U.S. law that established civilian control over nuclear energy and restricted the sharing of atomic information, laying the foundation for American nuclear policy during the early Cold War.
Referenced by (3)
Full triples — surface form annotated when it differs from this entity's canonical label.
this entity surface form:
McMahon Act amendments