Hyde Park Aide-Mémoire

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Hyde Park Aide-Mémoire was a 1944 joint declaration by U.S. President Franklin D. Roosevelt and British Prime Minister Winston Churchill that reaffirmed and extended Anglo-American cooperation on the development of atomic weapons.


Statements (46)
Predicate Object
instanceOf World War II agreement
diplomatic document
joint declaration
affects coordination of atomic research between US and UK
authoringParty Government of the United Kingdom
Government of the United States
category 1944 in international relations
Nuclear weapons diplomacy
United States–United Kingdom relations
classifiedStatusAtCreation secret
concerns Anglo-American cooperation on atomic weapons
Manhattan Project collaboration
development of atomic weapons
nuclear weapons research
dateSigned 1944-09-18
diplomaticRelationship United States–United Kingdom military cooperation
extends Quebec Agreement
followedFrom Quebec Agreement of 1943
hasParticipant British scientific mission to the Manhattan Project
United States Army
hasShortDescription 1944 US–UK declaration on atomic weapons cooperation
hasTitle Hyde Park Aide-Mémoire
historicalContext Allied wartime scientific cooperation
involves coordination of atomic bomb development policy
sharing of nuclear research information
isPartOf Allied wartime agreements on nuclear weapons
language English
mentions postwar control of atomic energy
purpose to extend collaboration on nuclear research and production
to reaffirm Anglo-American cooperation on atomic weapons development
reaffirms Quebec Agreement
relatedTo Anglo-American nuclear cooperation
Manhattan Project
signatory Franklin D. Roosevelt
Winston Churchill
signatoryCountry United Kingdom
United States
signedAt Hyde Park, New York
signedByOfficeHolder President of the United States
Prime Minister of the United Kingdom
signedDuring World War II
signedInCountry United States
subjectMatter atomic energy
military technology
scientific collaboration
yearSigned 1944

Referenced by (3)

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