The Manhattan Project was a top-secret research project undertaken during World War II by the United States, with the assistance of the United Kingdom and Canada, to develop the world's first atomic bomb. The project, named after the Manhattan District of the U.S. Army Corps of Engineers because that's where it began, started in 1939 amid fears that Nazi Germany was also working on nuclear weapons. Crucial scientific contributions were made by several famous physicists, including Robert Oppenheimer, Niels Bohr, and Albert Einstein. The project culminated in the bombings of Hiroshima and Nagasaki in Japan in August 1945, which resulted in Japan’s surrender ending World War II. However, it also ushered in the nuclear age, providing the foundation for the subsequent nuclear arms race during the Cold War. The ethical implications of the use of nuclear weapons continue to be debated.

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