Why didn’t you bold “subjects” in Natural Born Subject? Perhaps, because you know you can not equate a Natural Born Subject with a Natural Born Citizen?
VATTEL!
"THE VENUS, 12 U.S. (8 Cranch) 253, 289 (1814) (Marshall, C.J. concurring) (cites Vattels definition of Natural Born Citizen);
SHANKS V. DUPONT, 28 U.S. 242, 245 (1830) (same definition without citing Vattel)
MINOR V. HAPPERSETT, 88 U.S.162,167-168 ( 1875) (same definition without citing Vattel);
EX PARTE REYNOLDS, 1879, 5 Dill., 394, 402 (same definition and cites Vattel):
UNITED STATES V WARD, 42 F.320 (C.C.S.D. Cal. 1890) (same definition and cites Vattel.)"
http://www.scribd.com/doc/17519578/Kerchner-v-Obama-Congress-DOC-34-Plaintiffs-Brief-Opposing-Defendants-Motion-to-Dismiss
From Vattel's (original) French version.
I am quoting a primary source on English law in the middle of the eighteenth century. The law that all 55 men at the Philadelphia Convention were familiar with. The law they grew up with, the law they knew when they were proud to call themselves Englishmen, before July 4, 1776. Before the American Revolution the men in that hall were proud to call themselves subjects of the King of Great Britain. The transmutation of subjects into citizens was part of what the American Revolution was fought about.
If the Constitutional Convention had wanted to require the President to be born in the United States of two American citizens they would have said so in so many words.