On This Day: Einstein–Szilard Letter Gives Birth To The Manhattan Project

On Aug 2, 1939, a letter written by physicist Leo Szilard and signed by famed physicist Albert Einstein was sent to President Franklin D. Roosevelt in which they warned of possible German development of atomic weapons.  In the letter, Szilard and Einstein urged Roosevelt to initiate a nuclear program in the United States.  As the Second World War raged, the United States, along with the United Kingdom, and Canada, implemented the Manhattan Project, in which the first deployable nuclear weapons were developed from 1942 to 1946.

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