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Secrecy has been a constant companion of nuclear weapons since their inception. From scientists self-censoring out of fear that Nazi Germany would obtain information on nuclear weapons development, to diverse political forces in the United States engaging in heated debates over nuclear secrecy and anti-secrecy. This book tells the complete history of the evolution of the U. S. Nuclear secrecy system from the birth of the atomic bomb in the 1940s to today. This book takes the evolution of the nuclear secrecy system as the main line, combines a large number of declassified documents and archives, public information, and the stories of participants and participants in several historical events. It traces in detail the origin of the U. S. Nuclear secrecy system in the context of World War II, the U. S. Atomic energy legislation process in the late World War II and after the end of World War II, the establishment of the nuclear secrecy system during the Cold War, and the various challenges faced by the nuclear secrecy system since the 1960s. It presents the game of diverse political forces in the United States around the issue of nuclear secrecy in different eras, and reveals how the nuclear secrecy system of nearly a century has shaped the national security system of the United States today.