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Blackstone's Comentaries were published in the decade before the American Revolution. They are considered to be the source about the English law which was inherited by the American colonies when they declared their independence.

I have changed the long s’s (which look like f’s) into short s’s, so that the text is easier to read.

This is the URL to Chapter 10.

http://avalon.law.yale.edu/18th_century/blackstone_bk1ch10.asp

Blackstone's Commentaries on the Laws of England

Book the First : Chapter the Tenth : Of People, Whether Aliens, Denizens or Natives

page 354

...

THE first and most obvious division of the people is into aliens and natural-born subjects. Natural-born subjects are such as are born within the dominions of the crown of England, that is, within the ligeance, or as it is generally called, the allegiance of the king; and aliens, such as are born out of it. Allegiance is the tie, or ligamen, which binds the subject to the king, in return for that protection which the king affords the subject.

...

pages 361-362

...

THE children of aliens, born here in England, are, generally speaking, natural-born subjects, and entitled to all the privileges of such. In which the constitution of France differs from ours; for there, by their jus albinatus, if a child be born of foreign parents, it is an alien.