Gee ... ya think maybe USAAF, BBC and Luftwaffe might have had something to do with that?
Yeah, one characteristic of gloom-and-doomers is to constantly make relativistic global economic comparisons to 1946, when Japan, Germany, China, and most of the rest of Europe were leveled, and Britain economically crippled.
The root cause of most economic idiocy is focusing not on your inherent wealth but the relative wealth of yourself to others. The rest of the world becoming richer doesn't make the US poorer.