The “natural” in “natural born” citizen/subject stillmeant in the eighteenth century (as it had much earlier) a citizen/subject bythe law of nature (as opposed to a citizen/subject by statute). For people in the English tradition thatwould have meant people who were citizens under common law. That in turn meant only people born withinthe sovereign’s territory (and children of English ambassadors). In this view, the statutory expansions gavesome children born abroad the same rights and duties as natural born subjects,but those children remained nonetheless only statutory subjects (since astatute could not alter the law of nature). Notably, only this version gives content to the word “natural” in“natural born.”
And the children of citizens of the United States, that may be born beyond sea, or out of the limits of the United States, shall be considered as natural born citizens: Provided, That the right of citizenship shall not descend to persons whose fathers have never been resident in the United States: Provided also, That no person heretofore proscribed by any state, shall be admitted a citizen as aforesaid, except by an act of the legislature of the state in which the person was proscribed. (Emphasis added.)
Eighteen Year Olds and the Right to Vote
The right of citizens of the United States, who are eighteen years of age or older, to vote shall not be denied or abridged by the United States or by any State on account of age.
Slavery and Involuntary Servitude
Obama's Third Term as President
No person shall be elected to the office of the President more than twice, and no person who has held the office of President, or acted as President, for more than two years of a term to which some other person was elected President shall be elected to the office of President more than once.
But this Article shall not apply to any person holding the office of President when this Article was proposed by Congress, and shall not prevent any person who may be holding the office of President, or acting as President, during the term within which this Article becomes operative from holding the office of President or acting as President during the remainder of such term.
It is, in fact, entirely a post-hoc rationalization that simply cobbles onto the stated power of naturalization an additional, unstated, power to give new meaning to the phrase "natural born citizen" in the Constitution, or to confirm in Congress a power asserted by Parliament when it granted "natural born subject" status to various individuals overtime.