Codename Manhattan Project: How America Beat Hitler in the Race for the Atomic Bomb

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The Manhattan Project was the code name for the American-led effort to develop a functional atomic weapon during World War II. The controversial creation and eventual use of the atomic bomb engaged some of the world’s leading scientific minds, as well as the U.S. military-and most of the work was done in Los Alamos, New Mexico, not the borough of New York City for which it was originally named. The Manhattan Project was started in response to fears that German scientists had been working on a weapon using nuclear technology since the 1930s-and that Adolf Hitler was prepared to use it.
America Declares War
The agencies leading up to the Manhattan Project were first formed in 1939 by President Franklin D. Roosevelt, after U.S. intelligence operatives reported that scientists working for Adolf Hitler were already working on a nuclear weapon.
At first, Roosevelt set up the Advisory Committee on Uranium, a team of scientists and military officials tasked with researching uranium’s potential role as a weapon. Based on the committee’s findings, the U.S. government started funding research by Enrico Fermi and Leo Szilard at Columbia University, which was focused on radioactive isotope separation (also known as uranium enrichment) and nuclear chain reactions.
The Advisory Committee on Uranium’s name was changed in 1940 to the National Defense Research Committee, before finally being renamed the Office of Scientific Research and Development (OSRD) in 1941 and adding Fermi to its list of members.
That same year, following the Japanese attack on Pearl Harbor, President Roosevelt declared that the U.S. would enter World War II and align with Great Britain, France and Russia to fight against the Germans in Europe and the Japanese in the Pacific theater.
The Army Corps of Engineers joined the OSRD in 1942 with President Roosevelt’s approval, and the project officially morphed into a military initiative, with scientists serving in a supporting role.
The Manhattan Project Begins
The OSRD formed the Manhattan Engineer District in 1942, and based it in the New York City borough of the same name. U.S. Army Colonel Leslie R. Groves was appointed to lead the project.
Fermi and Szilard were still engaged in research on nuclear chain reactions, the process by which atoms separate and interact, now at the University of Chicago, and successfully enriching uranium to produce uranium-235.
Meanwhile, scientists like Glenn Seaborg were producing microscopic samples of pure plutonium, and Canadian government and military officials were working on nuclear research at several sites in Canada.
On December 28, 1942, President Roosevelt authorized the formation of the Manhattan Project to combine these various research efforts with the goal of weaponizing nuclear energy. Facilities were set up in remote locations in New Mexico, Tennessee and Washington, as well as sites in Canada, for this research and related atomic tests to be performed.
Robert Oppenheimer and Project Y
Theoretical physicist J. Robert Oppenheimer was already working on the concept of nuclear fission (along with Edward Teller and others) when he was named director of the Los Alamos Laboratory in northern New Mexico in 1943.
Los Alamos Laboratory-the creation of which was known as Project Y-was formally established on January 1, 1943. The complex is where the first Manhattan Project bombs were built and tested.
On July 16, 1945, in a remote desert location near Alamogordo, New Mexico, the first atomic bomb was successfully detonated-the Trinity Test-creating an enormous mushroom cloud some 40,000 feet high and ushering in the Atomic Age.
Scientists working under Oppenheimer had developed two distinct types of bombs: a uranium-based design called “the Little Boy” and a plutonium-based weapon called “the Fat Man.” With both designs in the works at Los Alamos, they became an important part of U.S. strategy aimed at bringing an end to World War II.
With the Germans sustaining heavy losses in Europe and nearing surrender, the consensus among U.S. military leaders in 1945 was that the Japanese would fight to the bitter end and force a full-scale invasion of the island nation, resulting in significant casualties on both sides.