November 15, 2019
Manhattan Project Timeline
⟶ Updated 15 days ago ⟶
List of edits
Uranium Fission is discovered by Lise Meitner and Otto Hahn
Albert Einstein and Leo Szilard write a letter to President Franklin Delano Rosevelt that the Nazi’s may be researching nuclear fission for weaponization.
The Advisory Committee on Uranium was founded by FDR in order to continue research on Uranium Fission.
Plutonium is discovered by Glenn Seaborg.
The Advisory Committee on Uranium informed FDR that they were ready to begin experiments with fissionable material and a production plant was necessary.
The Advisory Committee on Uranium (which would soon become known as he Manhattan Project) is permitted to perform experiments and granted a production plant under the direction of Colonel James C. Marshall.
President Franklin Delano Rosevelt dies and Harry S. Truman becomes president.
President Truman orders the use of atomic weapons on Japan.
The “Little Boy” bomb is detonated over Hiroshima killing 145,000 people.
The “Fat Man” bomb is detonated over Nagasaki killing 70,000 people.
Japan surrenders to the Allies ending World War II.
The Atomic Energy Act of 1946 is passed giving the Atomic Energy Commission control over all the nuclear research and weapons development which officially ends the Manhattan Project.
The Soviet Union successfully tests their first nuclear device the “RDS-1”.
The World’s first thermonuclear explosion (the Hydrogen Bomb) takes place which was the work of the agencies succeeding the Manhattan Project.
The Soviet Union detonates its first thermonuclear device.
The Cold War officially ends.
World War II
The Cold War begins.
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