“Would U.S. leaders push the button?” Reid B. C. Pauly provocatively asks in the title of his recent International Security article. We know from history that the answer to that question has been an almost unqualified no. To date, President Harry S. Truman remains the only world leader to have ordered nuclear weapons to be used in war; since the atomic destruction of Hiroshima and Nagasaki no leader has pushed this symbolic nuclear button. This non- use of nuclear weapons has puzzled scholars for decades.

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