On September 1, 1939 Germany invaded Poland officially beginning World War II. (Energy.gov) (Atomic Archive) Alexander …show more content…
(Atomic Archive) (Energy.gov) Uranium isotope separation facilities are built at Oak Ridge, Tennessee; plutonium production reactors are built at Hanford, Washington; and a weapons laboratory is set up at Los Alamos, New Mexico. (Atomic Archive) (Energy.gov) A microscopic sample of pure plutonium is produced in August of 1942. (Atomic Archive) Under the grandstands of Stagg Field at the University of Chicago the first controlled Nuclear Chain Reaction was produced on December 2, 1942. (U.S. History) (Energy.gov) (Atomic Archive) In 1943 there was a committee composed of Americans, Britain, and Canadians who cooperatively worked on the Manhattan Project. (Encyclopædia Britannica Inc.) On September 8, 1943 Italy surrenders to Allied forces. (Atomic Archive) On April 12, 1945 President Roosevelt dies and Harry Truman becomes President. (Energy.gov) (Atomic Archive) The whole project was kept well under wraps so much so that Vice-President Harry Truman didn’t even know about it until he became President. (U.S.