||The Constitution does not say who will become traitors, by "levying war against the United States, or adhering to their enemies, giving them aid and comfort."
It is, therefore, only by inference, or reasoning, that we can know who will become traitors by these acts.
Certainly if Englishmen, Frenchmen, Austrians, or Italians, making no professions of support or friendship to the United States, levy war against them, or adhere to their enemies, giving them aid and comfort, they do not thereby make themselves traitors, within the meaning of the Constitution; and why? Solely because they would not be traitors in fact. Making no professions of support or friendship, they would practice no treachery, deceit, or breach of faith. But if they should voluntarily enter either the civil or military service of the United States, and pledge fidelity to them, (without being naturalized,) and should then betray the trusts reposed in them, either by turning their guns against the United States, or by giving aid and comfort to their enemies, they would be traitors in fact; and therefore traitors within the meaning of the Constitution; and could be lawfully punished as such.
There is not, in the Constitution, a syllable that implies that persons, born within the territorial limits of the United States, have allegiance imposed upon them on account of their birth in the country, or that they will be judged by any different rule, on the subject of treason, than persons of foreign birth. And there is no power, in Congress, to add to, or alter, the language of the Constitution, on this point, so as to make it more comprehensive than it now is. Therefore treason in fact – that is, actual treachery, deceit, or breach of faith – must be shown in the case of a native of the United States, equally as in the case of a foreigner, before he can be said to be a traitor.