[El Gato]

The court, to my knowledge, has never ruled that a citizen at birth is not a natural born citizen. They have never created seperate classes of people who aquired citizenship at birth

Sure they have. Anyone born outside the country, but a citizen at birth under statue law (not including the children of diplomats and military stationed abroad), is a naturalized citizen. One of the more recent cases is Rogers v. Bellei, 401 U.S. 815 (1971). There's a good discussion, with links to the relevant cases at Justicia Naturalization and Citizenship

[bushpilot1]