Well the US like Australia, Canada, India and New Zealand inherited it from UK.

Given that all these countries punch above their weight in economic and democratic stability... Surely there is a case for having that as the basis of international law? - Bias as I am a Kiwi-Aussie with a UK parent.

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As for the EU being an international body. One would have to be so Eurocentric to belive that Europe is the whole world. It is as international as a baseball World Series...