GDP doesn't measure wealth.
You can make GDP look good by routinely demolishing cities and rebuilding them without a war. War is just the excuse.
This is funny. Austrians use the boom of the Long Depression to bolster their arguments despite the widespread suffering, but when a major government intervention unequivocally -ends- that suffering (alongside a boom), it doesn't count. Because the US was really suffering in the postware period compared to the prewar.