Einstein was always opposed to all weapons, not just nuclear. He really saw no difference between a rifle and a nuclear bomb, both killed.
He had signed the warning letter (written by Leo Szilard in Einstein's name because Einstein was famous and Szilard wasn't) because he was more afraid of nuclear weapons in the hands of the Nazis than in the hands of the U.S.
Even though he signed the letter, he really wished that physics did not allow the construction of nuclear bombs. But the first warning of the letter was that the U.S. had to determine that first. As it was soon shown that physics did allow it, the U.S. began work on making them just in case the Nazis were doing so also, so that we had a "defense" by attacking back.
Nova Net Answer: Scientists used it to develop nuclear power.
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 first Nuclear Bomb was made in 1945. Robert Oppenheimer led the "Manhattan Project", codename used for the ultra secret project in order to build a new weapon before Nazi Germany. The programm began in 1942. Roosevelt deciding to give nuclear power to the US after Pearl Harbour attack (7 decembre 1941). Hundreds of scientists participated in the elaboration of the Bomb, each of them only knowing the specific part of his work. The whole project being only known by highest generals, Oppenheimer and President Roosevelt.
The president at the time of the Three Mile Island nuclear incident was Jimmy Carter.
Other than writing the letter to Roosevelt at the request of Leo Szilard (who held the Nuclear Chain Reaction patent already), which got Roosevelt to begin a study committee with a budget of $6000, Einstein did not participate. Eventually the committee recommended starting a full development program, which became the Manhattan Project.
President Franklin D. Roosevelt
the letter inspired nuclear fusion.
Franklin D. Roosevelt.
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Franklin D Roosevelt
Franklin D. Roosevelt
The first nuclear bombs were developed in the United States of America during the Second World War in 1939 under the order of President Franklin Roosevelt.
Scientists used it to develop Nuclear Power
No president invented any nuclear bomb.
Harry S. Truman, who had been Vice-President for only 3 months, took over when Roosevelt died on April 12, 1945, just before the end of World War II. Truman was responsible for authorizing the nuclear strikes against Japan later that year.