The Manhattan Project was a secret military project created in 1942 to produce the first US nuclear weapon.
The history of the Manhattan Project remained classified for many years. In fact, it was so secret that Harry S. Truman, although vice president of the United States, was not made aware of its existence until after the death of Roosevelt in 1945. The explosion created a crater which measured nearly 2,400 feet across and was equivalent to about 20,000 tons of TNT. The Manhattan Project produced three bombs: the first bomb was known as Gadget and was used as a test model. Manhattan Project. The Manhattan Project was a secret military project created in 1942 to produce the first US nuclear weapon. Fears that Nazi Germany would build and use a nuclear weapon during World War II triggered the start of the Manhattan Project, which was originally based in Manhattan, New York.  By the summer of 1945, Oppenheimer was ready to test the first bomb. On July 16, 1945, at Trinity Site near Alamogordo, New Mexico, scientists of the Manhattan Project readied themselves to watch the detonation of the world's first atomic bomb. The device was affixed to a 100-foot tower and discharged just before dawn. The Seattle Times has created one of the definitive sites examining the development of the atomic bomb. The Manhattan Project, which included some of history's greatest scientific minds, lead to the end of the war against the Japanese. The Manhattan Project was a research and development project that produced the first nuclear weapons during World War II. The United States had already spent more than $1 billion ($13,600,000,000 today), while in 1943, the United Kingdom had spent about £0.5 million. Chadwick thus pressed for British involvement in the Manhattan Project to the fullest extent and abandon any hopes of a British project during the war. The Manhattan Project was a research and development project that produced the first atomic bombs during World War II. It was led by the United States with the support of the United Kingdom and Canada. The Manhattan Project began modestly in 1939, but grew to employ more than 130,000 people and cost nearly US$2 billion (about $26 billion in 2015 dollars). Over 90% of the cost was for building factories and producing the fissionable materials, with less than 10% for development and production of the weapons. The main assembly plant was built at Los Alamos, New Mexico. Robert Oppenheimer was put in charge of putting the pieces together at Los Alamos. After the final bill was tallied, nearly $2 billion had been spent on research and development of the atomic bomb. The Manhattan Project employed over 120,000 Americans. The Seattle Times has created one of the definitive sites examining the development of the atomic bomb. The Manhattan Project, which included some of history's greatest scientific minds, lead to the end of the war against the Japanese. Manhattan Project, the wartime effort to design and build the first nuclear weapons (atomic bombs). With the discovery of fission in 1939, it became clear to scientists that certain radioactive materials could be used to make a bomb of unprecented power. The name Manhattan Project was the code word for the development of the atomic bomb. On July 16, 1945, the first atomic bomb was tested at the Trinity Site in New Mexico. The weapon was later used against the Japanese to end World War II. The Manhattan Project. World War II started on September 1 1939, when Germany attacked Poland. By 1941, the Germans were ahead in the race for the atomic bomb. They had a heavy-water plant, high-grade uranium compounds, capable scientists and engineers, and the greatest chemical engineering industry in the world. The explosion created a crater which measured nearly 2,400 feet across and was equivalent to about 20,000 tons of TNT. The Manhattan Project produced three bombs: the first bomb was known as Gadget and was used as a test model. By the start of 1945 the Manhattan Project had 'turned the corner'. The uranium bombs seemed assured of success in a matter of months. The prospects for the plutonium bomb were looking up although meeting an August 1 deadline imposed by Groves was far from certain. Despite its official founding in August, the Manhattan Project really began on September 17, 1942 when Col. Leslie Richard Groves was notified at 10:30 a.m. by Gen. Brehon Somervell that his assignment overseas had been cancelled. The Manhattan Project was an epic, secret, wartime effort to design and build the world's first nuclear weapon. Commanding the efforts of the world's greatest physicists and mathematicians during World War II, the $20 billion project resulted in the production of the first uranium and plutonium bombs. The name Manhattan Project was the code word for the development of the atomic bomb. On July 16, 1945, the first atomic bomb was tested at the Trinity Site in New Mexico. The weapon was later used against the Japanese to end World War II.
http://www.u-s-history.com/pages/h1644.html http://nuclearfiles.org/menu/key-issues/nuclear-weapons/history/pre-cold-war/manhattan-project/ http://www.ushistory.org/us/51f.asp https://en.wikipedia.org/wiki/Manhattan_Project https://en.wikipedia.org/wiki/Timeline_of_the_Manhattan_Project http://www.ushistory.org/us/51f.asp http://www.encyclopedia.com/topic/Manhattan_Project.aspx http://www.u-s-history.com/pages/h1644.html http://nuclearweaponarchive.org/Usa/Med/Med.html http://www.encyclopedia.com/topic/Manhattan_Project.aspx
what created the start of the manhattan project