How did the Manhattan Project happen?

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A couple of prominent physicists wrote up a warning letter, had it signed by Albert Einstein, and had it delivered to US president Franklin D. Roosevelt, urgently warning of the potential development of a new type of extremely powerful bombs, in August of 1939.
In June of 1941, the Office of Scientific Research and Development was created by FDR's Executive Order 8807. They were authorized to engage in research and establish large engineering projects.
In October, FDR approved the atomic program and got in touch with England's Prime Minister Winston Churchill, recommending correspondence in matters atomic, and project sites were established in the US & Canada.
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What was the Manhattan Project?

The Manhattan Project was the top secret military endeavor tobuild, and detonate the first atomic bomb. It was based at LosAlamos, New Mexico and headed by Dr. J. Robert Oppen

What is the Manhattan project?

The Manhattan Project was the project to develop the first nuclearweapon (atomic bomb) during World War II by the United States, theUnited Kingdom, and Canada. Formally design

Who was in the Manhattan Project?

The Manhattan Project was the name for a project conducted during World War II, to develop the first atomic bomb. It refers specifically to the period of the project from

What was the goal of the Manhattan project?

The goal of the Manhattan Project was to create nuclear fissionreactions. This was done to determine the mass of any radioactivematerial in the creation of an atomic bomb.

What caused the Manhattan project?

Albert Einstein was a German, Jewish scientist escaping Europe during WWII. When he arrived in the U.S. he informed the government that the Germans were researching how to con