Summary

Portrait of Morrison Waite Morrison Waite United States v. Arjona — Opinion of the Court

Whether the offense as defined is an offense against the law of nations depends on the thing done, not on any declaration to that effect by congress. As has already been seen, it was incumbent on the United States as a nation to use due diligence to prevent any injury to another nation or its people by counterfeiting its money or its public or quasi public securities.
Source: Wikisource

Portrait of Morrison Waite Morrison Waite United States v. Arjona — Opinion of the Court

The right, if it exists at all, is given by the law of nations, and what is law for one is, under the same circumstances, law for the other. A right secured by the law of nations to a nation, or its people, is one the United States, as the representatives of this nation, are bound to protect. Consequently, a law which is necessary and proper to afford this protection is one that congress may enact, because it is one that is needed to carry into execution a power conferred by the constitution on the government of the United States exclusively.
Source: Wikisource

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