Comment: It was defined in Vattel's book in 1758

de Vattel’s Law of Nations circa 1758 Book 1, Chapter XIX, § 212:

"The natives, or NATURAL-BORN CITIZENS, are those born in the country, of parents who are citizens…The country of the fathers is therefore that of the children; and these become true citizens merely by their tacit consent."

Within the last 100 years we have new laws that allow babies born on the soil from foreign parents to be considered citizens. This was not automatically so at the time of the signing of the constitution. These new laws have created a new type of citizen. This is that native born citizen status that some call it. Native born term is confusing as it has been used in other ways. This is why I called it Plain citizen......or refer to them as just "citizen".