And then the tariffs go away and boom! Rug pull!

Some banks, like HSBC, will allow you to hold foreign currency accounts. There are also things like Wise, but I haven’t looked much in to it.

I don’t see the point of holding EUR though as you can’t spend them here. You’d be better off investing in a currency ETF, or just international stocks/funds if your goal is to diversify from the US.

I read an interesting book based on this premise called The Forever War, it’s been awhile but it was pretty good!

Similar premise but with soldiers sent to fight a war and eventually finding it already over.