Political Memes

We can say, because the things you list are almost completely independent of the fact that Germany, Japan, France (to a certain extent), and later China all made major advancements in their industrial capabilities post-war, and they (along with countries within their geographic and political spheres of influence) didn’t have to buy from the US anymore.

Would a 1970s and 1980s green energy revolution in the US have been a good thing that would have benefitted the United States? Most likely yes (and everyone else for that matter) — but again, that doesn’t change the fact that the countries left with minimal industrial output post WWII were going to rebuild that output. Individually many of them my not have surpassed the US (and may never do so), but in aggregate they (especially China) have reduced the US’s near sole-source influence they had on the supply chain for manufactured goods in the 50s and 60s. This was always going to be outside the US’s control and ability to change in any significant manner — they were always going to go from “virtually no competition” to “competition with virtually everyone” in the post-war years.