[RegulatorCountry]

The US Supreme Court has said the meaning is found in common law. Not Vattel, but common law.

... and then went on to cite Vattel nearly verbatim. Clearly, "common law" did not mean English common law. We'd fought wars to separate ourselves from England, you know.

[Mr Rogers]

No, they went on to deny Vattel’s definition and use the one provided by English common law.