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One was the discovery of Plutonium.
I suggest reading Richard Rhodes book: The Making of the Atomic Bomb.
Atomic Bomb
She was asked to help create the first atomic bomb but declined. But she is the mother of the atomic bomb because her discoveries created it.
FDR
The atomic bomb helped peopole know more about radiation poisining and helped in the advancements in neuclear energy.
The United States
Creation of the atomic bomb
well, the atomic bomb research was done by Robert oppenheimer. the original creation or idea was from albert Einstein
I believe you are referring to Albert Einstein, but he was not allowed to join the Manhattan Project because of his foreign birth. His atomic theories were responsible for the creation of the atomic bomb, but he did not help in its construction and testing.
yes
Its creation shows how certain people like the Americans took drastic measures in order to protect their soldiers. They had a choice to either invade Japan with their armies, with casualties estimated to be high, or simply drop a bomb on Hiroshima and Nagasaki and have no casualties at all. The atomic bomb helped ensure the Axis powers' defeat by kicking Japan out of the war and isolating Germany.