[GAB-1955]

The U.S. Constitution does NOT incorporate Vattel’s book by reference. “Law of Nations” is irregular capitalization.

[kosciusko51]

Actually, if you read the whole .pdf, you will note that Vattel is explicitly called out. Page 19 specifically refers to Vattel, as does Pages 20, 21, and 29. Vattel is recognized as a legal source.