Ironically, many of the scientists involved in making the bomb had defected from Germany. It started small, but as the bomb became more real, the United States added scientists and funding to be sure they were the first to have the bomb. The Manhattan Project was the name for the research and development program for the atomic bomb.
As a result, Roosevelt set up the Manhattan Project. He wrote a letter to US President Franklin Roosevelt telling him about the atom bomb. When he realized that such a bomb could be made, he was frightened about what might happen if Hitler and Germany learned how to make the bomb first. The mushroom cloud above Nagasaki, Japan from the atomic bombĪlbert Einstein came up with many of the theories that helped scientists in making the atomic bomb.