Note that almost every exchange outside the US has been flat or negative for decades. The US has held a precious position for a few generations that’s made “chart go up” feel like a given
As someone who works in finance this struck me as a remarkable claim. Upon inspection it turns out to be spectacularly incorrect. After adjusting for inflation it's actually the opposite, the vast majority of countries have seen their own version of the S&P 500 grow over a 30 year period, after adjusting for inflation, not stagnation or decline. Developing countries, particularly those in Asia, have seen incredible returns over a 30 year period, albeit with a great deal of volatility involved.
Our neighbor to the north, Canada, has seen gains that are slightly below the U.S., but our neighbor to the south, Mexico has seen about the same growth as our own, once again accounting for Mexico's own inflation.
Europe has also experienced a great deal of growth with many European countries even growing moreso than the U.S., for example Germany.
While there are examples of decline, they are in countries that are both poor and have unstable governments. Most countries that are strictly poor but don't suffer from instability have for the most part seen growth rather than stagnation.
So I don't know exactly what led you to believe your claim that "almost every exchange" has been flat or negative, but it's certainly not correct.
Worth noting that a stock exchange becoming defunct is not the same as the value of the index associated with the stocks listed on that exchange going to zero.
For example numerous US stock exchanges also go defunct. Nevertheless the value of the stocks that traded on those exchanges remains unaffected. It's not like if NASDAQ went out of business tomorrow that Google and Microsoft would all declare bankruptcy.
The level of the MSCI China index 30 years ago was HKD 70 and it's HKD 75 today. It's kind of incredible but not in a good way. Total return is less than 3% p.a. MSCI Thailand is even worse.
MSCI Korea has a total return of 7% (not bad, 4% above inflation) but it doesn't do better than developed countries.
Of course they look much better if we start right after the 1997 Asian financial crisis but, hey, it was you who talked about "a 30 year period".
I can't make sense of that example. Are you maybe comparing the level of the S&P 500 with the DAX which is a total return index?
And the US itself was flat for over a decade, with the only thing saving a domestic investor's returns being bonds:
* https://www.forbes.com/sites/investor/2010/12/17/the-lost-de...
And as a Canadian, there are different sectors that would have given me positive gains over the years (I generally own mostly VEQT, a globally-diversified ETF):
* https://stingyinvestor.com/SC/PeriodicTableofAnnualReturns.p...
And it's perhaps looking more closely at what specifically about the US has been positive:
> Looking at this data, there are two distinct periods of extended U.S. outperformance—the late 1990s and today. And what do these two periods have in common? The rise of U.S. technology stocks. Bespoke Investment Group recently created this chart illustrating this phenomenon:
> Now that the U.S. technology sector makes up over 30% of the S&P 500 (as it did back in 2000), this begs the question: Is U.S. outperformance just a technological fad?
* https://ofdollarsanddata.com/do-you-need-to-own-internationa...
Outside of tech, how much better is the general US market than any other market?