Actually, we didn't recover all that well. In hindsight, we now recognise FDR as a Socialist in Democrat clothing. The programs he began in the 1930s were "hardened" during the war and, with a few exceptons, simply continued as neccesary for the recovery.
How many government agencies were founded before and during the war? How many were disbanded and/or shut down after it? Some had their names changed but their duties and influence actually increased after the shooting stopped.
No, America was on a slippery slide toward Socialism before the war. The end of hostilities only provided a short slowing period, followed by the nose-dive we now find ourselves in.