It is simple - if you were born of two American citizens then “naturally” you are a citizen.
If there is any procedural need for either parent to become a citizen after you were born then you are not a “natural born” citizen.
Two parents from Sweden or Japan or Russia or wherever who have a child here in America did not birth an American citizen.
This needs to be hammered home!
Two parents from Sweden or Japan or Russia or wherever who have a child here in America did not birth an a Natural born American citizen.