[AnimalMuppet]

Let's say you didn't invest in the US stock market, because you lived in, say, Japan. How did the Japanese stock market do since 1870? Pretty well, except for that part in 1945 when it went to approximately zero.

Ditto Germany in 1945.

Ditto Russia in 1918.

Ditto China in 1949.

Is the US going to be the US of history for the next 50 years? Or is it going to be one of Japan, Germany, China, or Russia?

Or is it just going to be, say, the UK? How did the UK stock market do over the last 50 years?

[its_ethan]

"Better be weary of making financial assumptions because you may end up on the losing side of a world war and then it will all be for naught" isn't very useful thinking imo

If you think America (or wherever you live) is going to end up like Germany in 1945, or Russia in 1918, then it won't matter in the slightest what you've invested in anyway - you plus everyone around you will be in the same (half underwater) boat.

"Ditto" for if $SPY suddenly tanks or underperforms. There are going to be much more immediate concerns for everyone if that happens.