Summary

Nathan Clifford Caperton v. Bowyer — Opinion of the Court

But whatever force the argument of convenience might have in a case arising between the United States and a foreign nation, it has very little in a case arising out of a defunct rebellion. It is no great hardship for parties who have plunged the country into a bloody and protracted war, and who have been pardoned for crimes the greatest known to the law-treason, murder, arson, and robbery among them-to be required to make redress for the injuries which their neighbors have sustained at their hands.
Source: Wikisource

Nathan Clifford Caperton v. Bowyer — Opinion of the Court

If it does, this can give this court no jurisdiction. The law of nations is not embodied in any provision of the Constitution, nor in any treaty, act of Congress, or any authority, or commission derived from the United States. It is true that the courts of the United States, like the courts of the States, and of all other civilized countries, recognize the law of nations as binding upon them
Source: Wikisource

Nathan Clifford Caperton v. Bowyer — Opinion of the Court

It may treat one of its insurgent citizens as an enemy and hold or exchange him as a prisoner of war, and another as a rebel and traitor and hang him for treason. Writers on international law say indeed that the rules and usages of civilized modern warfare, which are applicable to international wars, are equally applicable to civil wars. But they also say, that when an insurrection or rebellion is suppressed, the government may prosecute the parties that are engaged in it, and punish them for treason and rebellion.
Source: Wikisource

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