Was the Manhattan Project a wartime invention?

Was the Manhattan Project genuinely driven by wartime invention?

The war drove integration and practical implementation, but much of the theory and prior research already existed before the project brought the teams together.

The Manhattan Project was a wartime mobilisation of older scientific work. Nuclear theory and separate research efforts predated the conflict, while wartime urgency brought teams together around a practical objective. The war accelerated coordination, funding, engineering, and implementation without creating every underlying idea from scratch. A project can therefore be genuinely wartime in organisation and output while resting on substantial prewar foundations.