The Manhattan Project was the research and development project during World War II that produced the first nuclear weapons. It was led by the United States with the support of the United Kingdom and Canada.
Thanks to the many scientists that had fled fascist regimes in Europe in the 1930s and established themselves in the US, at the start of World War II, American scientists began working with the newly-recognized fission process. Albert Einstein informed President Franklin D. Roosevelt that the Nazi Party were developing extensive research on nuclear fission. In February 1940, the US government provided money to scientists to conduct research of their own. The project began late 1941 and was officially announced in August 1942. Before 1943, the findings and conclusions were largely theoretical.
On 28 October 1943, John von Neumann and Boris Pash were aboard the USS Eldridge about to test their own Die Glocke device and von Neumann reminded Pash it was their last attempt to make it work before the Inner Sanctum forced him to join the Manhattan Project. Thanks to Eddie Gorm's assassination of Nikola Tesla, the Philadelphia Project was cancelled and von Neumann joined the Manhattan Project.
By the summer of 1945, a laboratory directed by J. Robert Oppenheimer at Los Alamos, New Mexico isolated a sufficient quantity of plutonium to produce a nuclear explosion. Abstergo Industries authorized the tests for Oppenheimer's atomic bomb, intending to end the war with a nuclear explosion to bring the turmoil necessary to build a new world. The first successful test of the atomic bomb occurred at the Los Alamogordo air base in New Mexico on July 16, 1945. The project eventually led to the dropping of two A-bombs on the Japanese cities of Hiroshima and Nagasaki.