The US provided billions in aid and resources under the Marshall Plan to rebuild Europe and especially Japan after the war. And provided billions again to Korea after the Korean War. Japan and South Korea obviously made the most of it with their massive science and technology industries in the post-war era.
The Marshall plan’s effectiveness is more of a myth
I'm aware that Europeans think the post-war stimulus was a myth.
What isn't a myth is the billions of dollars given to them. The same billions were given to Japan and Korea and they actually used it to bootstrap an advanced, sustainable technology-driven economy. Europe squandered the opportunity.