I know we talked about this HJR 192 thing not long ago, found it in my files and forgot that I had read it once before, this is the caveat that brings the meaning of Lawful Money to the international scene, evidence of this was finding the Saskatchewan charter in Canada says that Lawful Money of Canada has the same meaning as Lawful Money of the United States of America.
It appears that everything was moved up to the international level one succession step at a time as was the Lieber Code mentioned before:
" The "Lieber Instructions" strongly influenced the further codification of the laws of war and the adoption of similar regulations by other states. They formed the origin of the project of an international convention on the laws of war presented to the Brussels Conference in 1874 and stimulated the adoption of the Hague Conventions on land warfare of 1899 and 1907. "
http://www.icrc.org/ihl.nsf/73cb71d18dc4372741256739003e6372/a25aa5871a04919bc12563cd002d65c5?OpenDocument