Final answer:
The Manhattan Project was a top-secret research program led by the US Army during World War II to develop the atomic bomb.
Step-by-step explanation:
The Manhattan Project was the Army's project to develop the atomic bomb during World War II. It was a top-secret research program that aimed to create a weapon capable of immense destructive power. It involved many scientists, engineers, and military personnel working together to harness the energy of nuclear reactions.
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