There have certainly been times in the last few unnecessarily-crazy weeks when I worried US Republicans would impose capital controls [0] like China does. Partly to affect how dollars are being used (or not used) and partly to prevent Americans from escaping with more than whatever they can carry through a border checkpoint.

Just one among a bunch of things that would be unthinkable a decade ago.

[0] https://en.wikipedia.org/wiki/Capital_control