The earliest development of the preemptive war concept was by:

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The concept of preemptive war was first discussed by Thomas More in his 1516 book "Utopia", where he described a society that would wage preemptive war to prevent aggression from hostile nations. Leslie Groves and Curtis LeMay were military leaders involved in the development of nuclear weapons during World War II and the Cold War. Socrates, as a philosopher in ancient Greece, did not develop the concept of preemptive war.

The Earliest Development of the Preemptive War Concept Was By