The US isn't doing bad but it's had a relative decline because the rest of the world is advancing. In the 1950s much of the world was wrecked from WW2 and socialism didn't do much for India and China. Now they are mostly doing quite well.
In the cultural revolution China sent all it's educated out to the fields or worse. Now:
In the cultural revolution China sent all it's educated out to the fields or worse. Now:
>China awarded 1.38 million engineering bachelor’s degrees in 2020. The comparable American number is 197,000 https://asiatimes.com/2022/07/a-tale-of-two-talents/
That's China advance, not a US decline.