The country owns its territory and has a right to say who is allowed to enter it, the founders understood that well:
Article 1
Section 9. TheMigration or Importation of such Persons
as any of the States now existing shall think proper to admit, shall not be prohibited by the Congress prior to the Year one thousand eight hundred and eight
https://www.constitution.org/cmt/law_of_nations.htm
The meaning of "Offenses against the Law of Nations"
Art. I Sec. 8 Cl. 10 of the Constitution for the United States delegates the power to Congress to "define and punish ... Offenses against the Law of Nations"
. It is important to understand what is and is not included in the term of art "law of nations", and not confuse it with "international law". They are not the same thing. The phrase "law of nations" is a direct translation of the Latin jus gentium, which means the underlying principles of right and justice among nations, and during the founding era was not considered the same as the "laws", that is, the body of treaties and conventions between nations, the jus inter gentes, which, combined with jus gentium, comprise the field of "international law". The distinction goes back to ancient Roman Law.
Briefly, the Law of Nations at the point of ratification in 1788 included the following general elements, taken from Blackstone's Commentaries, and prosecution of those who might violate them:
(1) No attacks on foreign nations, their citizens, or shipping, without either a declaration of war or letters of marque and reprisal.
(2)
Honoring of the flag of truce, peace treaties, and
boundary treaties.
No entry across national borders without permission of national authorities.
(3) Protection of wrecked ships, their passengers and crew, and their cargo, from depredation by those who might find them.
(4) Prosecution of piracy by whomever might be able to capture the pirates, even if those making the capture or their nations had not been victims.
(5) Care and decent treatment of prisoners of war.
(6) Protection of foreign embassies, ambassadors, and diplomats, and of foreign ships and their passengers, crew, and cargo while in domestic waters or in port.
(7) Honoring of extradition treaties for criminals who committed crimes in a nation with whom one has such a treaty who escape to one's territory or are found on the high seas established with all nations in 1788,
(8) Prohibition of enslavement of foreign nationals and international trading in slaves.
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