Final answer:
The Manhattan Project was a top-secret research program during WW II to create the first nuclear weapons.
Step-by-step explanation:
The Manhattan Project was a research program designed by the United States during WW II to create the first nuclear weapons. It was a top-secret program that involved scientists, engineers, and other experts working together to develop the technology needed for atomic bombs. The project successfully produced the first atomic bombs, which were eventually used on the Japanese cities of Hiroshima and Nagasaki in 1945.
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