Continued Post-War Prosperity.

I am a bit iffy with the subject but I was always interested in the prosperity of post-WWII America and I wonder how it is possible to maintain that economic prosperity for a few more years at the least to a few more decades at the maximum. The POD basically begins the moment that World War II is officially over though you can easily go later on or early as long as it is after 1944 and before 1970. Bonus points if you are able to have as much of the entire world to share in the prosperity.
 
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