The Manhattan Project, which took place during World War II, was a U.S. government-run effort to research, build, and then use an atomic bomb. Mobilizing thousands of scientists worldwide and taking place across multiple continents, the project eventually resulted in the construction of the two atomic bombs dropped on Hiroshima and Nagasaki. 

How the project got started

In 1939, President Franklin Delano Roosevelt received a letter from physicist Albert Einstein with an urgent message: Physicists had recently discovered that the element uranium could generate vast amounts of energy — enough, perhaps, for a bomb. Einstein suspected that Hitler might already be working to stockpile the element.



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