> the day the global tech community stops posting on Hacker News, stops building with U.S origin technologies, and stops looking to Silicon Valley as a benchmark, that's the day we can seriously start talking about America's fall from global leadership.

I guess that's the correct answer to the question as posed. But it does raise another question: if it happens, something undermined the foundations of America's prosperity long before the fall. What was it?

This post to HN describes what lead to the US becoming a science superpower: https://news.ycombinator.com/item?id=43692360 I found it convincing. The post also speculated if those conditions were removed, it America's superpowers will wither.

My take on the post is science has exponential return on investment over the very long term. But the return is random in that most scientific investigations fail to yield a return, and the time span so long that the usual capitalist incentives don't work. Or to put it another way, firms making investing in basic science get out-competed in the short term by others that don't make the investment. So you have to find a way to make societies at large pay for basic science, and give way what works to the capitalist engine. The USA found a way to do that. It's beginning to look like China has too. Now the USA is winding back the investment.

On the positive side, I suspect it will take a long time to kill the institutions that drive the USA's prosperity, I suspect many more than 4 years of madness. Putin pulled the same thing off, but it took him decades.