Give this pedestrian a thumbnail sketch of what it's talking about, please.
How does a nation 'buy' dollars?
Why would they?
Why would we sell?
I vaguely understand FRN's ( but not really)
Anyway ... that's your job on FR ... edamucate us dumbo's.
I understand that it has potential significant consequences.
You'd be wise to ask others for advise on this subject. (Now, if you want to talk about anthropology/archaeology I'd be glad...)
I was under the impression they held U.S Treasury bonds.