It may not be defined to your satisfaction, but it is defined. A natural born citizen is one whose claim to citizenship derives naturally from the circumstances of his or her birth so that there is a natural and abiding connection between the child and the society and nation into which he or she is born.
“A natural born citizen is one whose claim to citizenship derives naturally from the circumstances of his or her birth so that there is a natural and abiding connection between the child and the society and nation into which he or she is born.”
And, according to the definition contained in the Naturalization Act of 1790, that means a child born of citizen parents.
Also, the same Act specified that citizenship descended from the father only. That concept held sway until 1930.
And since those definitions were locked into the Constitution, any following naturalization act cannot override what is written into the Constitution.
By the way, why does Cruz refuse to release his citizenship documentation, verification?
When he went to get his driver’s license when he turned 16, did he give them his mother’s birth certificate?