What was the secret code name for the building of the first atomic bomb?

Question

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The Manhattan Project was the codename for the building of the first atomic bomb during World War II. The project was initiated by the United States with the goal of developing nuclear weapons before Nazi Germany. It involved the work of over 130,000 people, including scientists, engineers, and military personnel, and cost over $2 billion at the time. The successful development of the atomic bomb led to its use in the bombings of Hiroshima and Nagasaki in August 1945.

What Was the Secret Code Name for the Building of the First