LMAO!!! You seem to forget, everything changed in 1866/1868, states no longer made citizens.Re: "Did the framers think the two were interchangeable? "
Native-born citizen and Natural-born citizen are synonyms. They were then, and they are now. In fact, as one major demonstration that they are synonyms and have long been considered so in common American use is the questions asked when men registered for the draft in WWI (yes, one).
They were asked whether or not they were citizens, and then, if they were, whether they were naturalized or natural born. Notice, only two possibilities, naturalized--meaning not citizens at birth---and natural born, meaning citizens at birth. Only two categories. Every citizen who is not naturalized is natural born.
That is the way that Tucker and Rawle, who knew the writers of the US Constitution, used the term Natural Born Citizen.
"Prior to the adoption of the constitution, the people inhabiting the different states might be divided into two classes: natural born citizens, or those born within the state, and aliens, or such as were born out of it. The first, by their birth-right, became entitled to all the privileges of citizens; the second, were entitled to none, but such as were held out and given by the laws of the respective states prior to their emigration....St. George Tucker, BLACKSTONE'S COMMENTARIES: WITH NOTES OF REFERENCE TO THE CONSTITUTION AND LAWS OF THE FEDERAL GOVERNMENT OF THE UNITED STATES AND THE COMMONWEALTH OF VIRGINIA.(1803)
"Therefore every person born within the United States, its territories or districts, whether the parents are citizens or aliens, is a natural born citizen in the sense of the Constitution, and entitled to all the rights and privileges appertaining to that capacity."---William Rawle, A VIEW OF THE CONSTITUTION OF THE UNITED STATES OF AMERICA. 2d ed.(1829)
Yep, in order to be a citizen at birth, you had to be "and subject to the jurisdiction, there of", just simply saying not a citizen of another nation at birth.
The US Constitution has never recognized a dual-citizenship status and the US can not strip a citizenship from anyone, unless requested by that person.