The Constitution specifically refers to The Law Of Nations, capitalized as a proper noun. As there is only one such book, it serves as the ONLY reference material on the subject. Later court decisions have been quite explicit in referring to this specific text, not to a general “law of nations”(lower case).
Checkmate.
It’s not referring to a book title. The original Constitution as written capitalizes various nouns because that was the style then. You are sadly mistaken if you think it is referring to a specific book title. Find one single reputable source that believes that. You cannot. Do your own research. Stop believing things you hear and verify what you read. Verify what *I* say.