The laws of these United States should always be a reflection of natural law. Our founders attempted to set us up with a non-tyrannous government. Laws that go against natural law are tyrannous.
Our Constitution only mentions or envisions two subdivisions of U.S. citizens going forward - those born with natural allegiance to these United States - and those that must be “naturalized” into that condition of allegiance.
No he wasn't or did E. de Vattel create natural law. He only observed and wrote about the subject in his treatise 'Principle of the Law of Nature Applied to the Conduct to the Affairs of Nations and Sovereigns. The title speaks for itself. He observed the natural behaviors or sovereigns over the centuries gone by. The Constitutional Founders were students of Vattel and believed in The Laws of Nations as they applied the the Law of Nations to the newly created US Constitution.