The motivator

“On 24 April [1945] Truman received from [Secretary of War] Stimson a letter requesting a meeting to discuss ‘a highly secret matter.’ . . . The Manhattan Project represented the most stupendous scientific effort in history. In three years, at a cost of $2 billion [$26-and-a-third billion in 2015 dollars], the U.S.—with some perfunctorily acknowledged British aid—had advanced close to fulfilling a programme which much of the scientific world had thought unattainable, certainly within a time frame relative to this conflict. . . . Technological determinism is an outstanding feature of great wars. At a moment when armadas of Allied bombers had been destroying the cities of Germany and Japan for three years, killing civilians in hundreds of thousands, the notion of withholding a vastly more impressive means of fulfilling the same purpose scarcely occurred to those directing the Allied war effort. . . . As long as Hitler survived, the Manhattan team had striven unstintingly to build a bomb, haunted by fear that the Nazis might get there first.” – Max Hastings, Retribution