Just, WOW! I hope the following explanation clears up some of the ambiguity for you.
What many people do not understand is that a person to be considered a Natural Born Citizen, must first be a native born citizen.
There are only three types of citizenship and ALL HAVE EQUAL RIGHTS: native born citizenship; naturalized citizenship; and, citizenship-by-statute. Note: Natural Born Citizenship IS NOT a type of citizenship. It is only a circumstance of birth required for eligibility to be President of the United States per the U.S. Constitution.
Native born citizenship (jus solis) was created by the United States v. Wong Kim Ark, 169 U.S. 649 (1898):
Wong Kim Ark was the child of two resident Chinese aliens unable to attain citizenship due to a treaty with the Emperor of China. Their son claimed U.S. Citizenship because of his birth on U.S. soil. He was vindicated by the Supreme Court on the basis of the 14th Amendment.
On the basis of the 14th Amendment the majority opinion coined a new definition for “native citizen”, as anyone who was born in the U.S.A. (jus solis) under the jurisdiction of the United States. The Court thus extended citizenship to all born in the country (excepting those born of ambassadors and foreign armies etc.) but it DID NOT extend the meaning of the term “natural born citizen” to those whose parents were not citizens at the time of the child’s birth.
Naturalized citizenship is granted to foreign nationals who apply for U.S. citizenship and go through the naturalization process. Gov. Arnold Schwarznegger is an example.
Citizenship-by-statute is granted to those born overseas to U.S. citizens (jus sanquinas). There is a whole array of legal statutes covering this, but this type of citizenship has the same rights as the other two types.
A ‘Natural Born Citizen’ is born in the U.S.A. of citizen parents. No need to be ‘natural born citizens’ themselves.
Since there is NO RIGHT to be President, the eligibility requirement of Natural Born Citizenship (jus solis + jus sanguinas: born in the U.S. to U.S. citizen parents) must be viewed as a means to prevent split allegience for any President of the United States.
I think we can all agree that such is a ridiculous standard that almost no American could qualify under, as almost no American doesn't have an immigrant grandparent or great-grandparent or great to the nth power grandparent that wasn't an immigrant to the USA.