The first nuclear bomb was developed under the guidance of American theoretical physicist J. Robert Oppenheimer during the Manhattan Project, which was an extensive research and development program started by the U.S. during World War II aimed at producing atomic weapons. The project was headquartered in Los Alamos, New Mexico, a location selected for its technical capacity and relative remoteness. The timeline of the project's development extends from its inception in 1939 to the end of the war in 1945. Oppenheimer officially became the director of the Los Alamos Laboratory in 1943. However, the "Trinity" test, which marked the first successful detonation of a nuclear weapon, occurred at 5:29 a.m. on July 16, 1945, in the Jornada del Muerto desert about 35 miles southeast of Socorro, New Mexico. It's important to note that the Manhattan Project wasn't just happening at Los Alamos. Other significant development and production sites involved in the project included Oak Ridge, Tennessee, and Hanford, Washington. Nonetheless, it was under Oppenheimer's leadership at Los Alamos that the first nuclear bomb, codenamed "Gadget", was successfully detonated. The creation and subsequent use of nuclear weapons marked a momentous shift in warfare and international relations, bringing about the nuclear age. This development continues to influence the world's geopolitical landscape, arms control negotiations, and the ongoing discourse on nuclear power and disarmament.