Comment by roenxi

In this context "trust" is something of a euphemism. The US had a big enough military relatively speaking that if they came for your gold then it wasn't feasible to stop them unless you were part of a competing bloc. So, you know. Keep the gold somewhere the US is happy with. Best shot of getting to a good outcome, and the US was pretty reasonable in the 1900s.

That all appears to have changed. They may already have lost the ability to physically coerce even medium powers and at any rate look like they have to retreat the boundaries of their global Not-An-Empire. So it makes sense to start rethinking the gold's physical location.