FDR. However Einstein did not write the letter to FDR he only signed it, Leo Szilard wrote it putting Einstein's name on it as FDR was more likely to respond to it that way, then Szilard convinced Einstein to sign it. The words were Szilard's only the signature was Einstein's.
Franklin d . Roosevelt
Franklin D Roosevelt
Franklin D. Roosevelt
Leo Szilard wrote a letter in Albert Einstein's name and had Einstein sign it (because Einstein was well known and thus much more likely that the president would take the letter seriously than if the letter was written in Szilard's name).
The United States' research and development that ultimately led to a successful fission explosion (Manhattan Project and Trinity Test at Alamogordo, New Mexico) was a direct response to scientists' concerns (voiced to President Roosevelt in a letter from Austro-Hungarian physicist Leo Szilard, and signed by Albert Einstein) that the Nazis were already conducting researching and development into nuclear energy and nuclear weapons. The United States wasn't the first nation to commit to research and development into nuclear weapons - it was the first to successfully develop, test, and deploy in the field a fission explosive device.
Franklin D. Roosevelt.
Franklin d . Roosevelt
Franklin D Roosevelt
Franklin D. Roosevelt
Albert Einstein wrote a letter to the president in 1939 warning him about the possibility of an atomic bomb.
I think it started by a letter of concern from Albert Einstein to President Franklin Roosevelt.
He played a role in its creation by sending a letter to convince president Roosevelt to start work on a nuclear weapon, and many of his theories went into the making of it. Einstein himself was a pacifist and regretted for the rest of his life that he had influenced the creation of nuclear weapons.
the letter inspired nuclear fusion.
write a letter warning him about an atomic bomb
He wrote a letter saying that he found a way to make a chain explosion with uranium
Albert Einstein .
Einstein wrote the letter to President Roosevelt in 1939 to alert him to the potential development of nuclear weapons by Nazi Germany and the importance of the U.S. starting its own nuclear research program to ensure national security.