Bombing of Hiroshima
Pilots Enola Gay during the uranium bomb attack.
Permanent historical records · Updated 2026-11-03
1945 in United States of America — Page 5
Explore 287 historical events and records for United States of America in 1945.
Historical records for United States of America in 1945
Sorted by month and day. Records with no month are shown last. Showing 40 of 287 unique records.
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August
Bombing of Hiroshima
"Little Boy", a gun-type uranium-235 weapon, is used against the city of Hiroshima, Japan
Bombing of Hiroshima
Authorises the use of atomic weapons against Japan.
Hiroshima Atomic Bombing
The United States drops an atomic bomb on Hiroshima, the first wartime use of a nuclear weapon.
Hiroshima Measurement
Measures effects from the uranium bomb mission.
Little Boy
Arms the uranium weapon used at Hiroshima.
Little Boy
"Little Boy", a gun-type uranium-235 weapon, is used against the city of Hiroshima, Japan
Manhattan Project
"Little Boy", a gun-type uranium-235 weapon, is used against the city of Hiroshima, Japan
Manhattan Project
"Little Boy", a gun-type uranium-235 weapon, is used against the city of Hiroshima, Japan
Charter Establishes Individual Criminal Responsibility
The Charter makes individuals answerable under international law rather than allowing state office alone to shield responsibility for charged crimes.
London Agreement Establishes International Military Tribunal
Jackson signs the London Agreement for the United States, creating the International Military Tribunal and defining its jurisdiction over major Axis war crimes.
London Agreement Signed for Major War Criminals
Jackson signs the agreement establishing an international tribunal to prosecute major European Axis war criminals whose offences lacked a single geographic location.
Prosecutors Committee Assigned Joint Indictment
The four Allied chief prosecutors receive responsibility for agreeing the defendants, preparing the indictment and coordinating presentation of the case.
Bombing of Nagasaki
"Fat Man", an implosion-type plutonium-239 weapon, is used against the city of Nagasaki, Japan
Bombing of Nagasaki
The USA drops the atomic bomb on Nagasaki
Fat Man
"Fat Man", an implosion-type plutonium-239 weapon, is used against the city of Nagasaki, Japan
Fat Man
"Fat Man", an implosion-type plutonium-239 weapon, is used against the city of Nagasaki, Japan
Manhattan Project
"Fat Man", an implosion-type plutonium-239 weapon, is used against the city of Nagasaki, Japan
Manhattan Project
"Fat Man", an implosion-type plutonium-239 weapon, is used against the city of Nagasaki, Japan
Nagasaki Atomic Bombing
The United States drops a second atomic bomb on Nagasaki three days after Hiroshima.
Further Atomic Bombing Halted
Truman orders that no additional atomic bombs be used without further presidential authority.
Manhattan Project
General Leslie Groves had commissioned Smyth to write the Report at Los Alamos during the Manhattan Project
Manhattan Project
The Smyth Report was the common name given to an administrative history written by physicist Henry DeWolf Smyth about the Allied World War II effort to develop the atomic bomb, the Manhattan Project
Manhattan Project
The Smyth Report was the common name given to an administrative history written by physicist Henry DeWolf Smyth about the Allied World War II effort to develop the atomic bomb, the Manhattan Project
Manhattan Project
General Leslie Groves had commissioned Smyth to write the Report at Los Alamos during the Manhattan Project
Manhattan Project
The Smyth Report is released to the public, giving the first technical history of the development of the first atomic bombs
Smyth Report
General Leslie Groves had commissioned Smyth to write the Report at Los Alamos during the Manhattan Project
Smyth Report
The Smyth Report was the common name given to an administrative history written by physicist Henry DeWolf Smyth about the Allied World War II effort to develop the atomic bomb, the Manhattan Project
Smyth Report
The Smyth Report was the common name given to an administrative history written by physicist Henry DeWolf Smyth about the Allied World War II effort to develop the atomic bomb, the Manhattan Project
Smyth Report
General Leslie Groves had commissioned Smyth to write the Report at Los Alamos during the Manhattan Project
Smyth Report
The Smyth Report is released to the public, giving the first technical history of the development of the first atomic bombs
Smyth Report
The Smyth Report was the common name given to an administrative history written by physicist Henry DeWolf Smyth about the Allied World War II effort to develop the atomic bomb, the Manhattan Project. The Smyth Report is released to the public, giving the first technical history of the development of the first atomic bombs
Smyth Report
The Smyth Report is released to the public, giving the first technical history of the development of the first atomic bombs
Result of Surrender of Japan
MacArthur begins implementing procedures for Japan's cessation of hostilities and formal surrender.
Result of Surrender of Japan
The United States announces Japan's unconditional surrender and the end of major Pacific hostilities.
Supreme Commander
Appointed Supreme Commander for Allied Powers
Surrender of Japan
Inititiates action with Japan for the cessation of hostilities
Surrender of Japan
Announces the unconditional surrender of Japan
Postwar Nuclear Arms Warning
Oppenheimer warns Stimson that atomic weapons will improve, defenses will remain inadequate, and the United States cannot expect a permanent nuclear monopoly.
Result of Surrender of Japan
MacArthur's arrival establishes the Allied command presence that will oversee Japan's formal surrender and occupation.
How these records were prepared
Generated from the World History Database historical_events table. Identical display records are collapsed; descriptions otherwise retain the stored text. Coverage and source quality vary. Check primary and specialist sources before citing individual historical claims.