U.S. Supreme Court has Ruled Obama Ineligible. Minor vs Happersett

The argument before the two courts is plain. "Natural Born Citizen" was not defined in the U. S. Constitution. It was later defined as children born of two U.S. citizens' regardless of the location of the birth. The U. S. Supreme Court found:  The Constitution does not, in words, say who shall be natural-born citizens. At common-law, with the nomenclature of which the framers of the Constitution were familiar, it was never doubted that all children born in a country of parents who were its citizens became themselves, upon their birth, citizens also. Resolution of that question was ultimately left to the decision of the United States Supreme Court and during 1875, that determination was made in a ruling and the decision was handed down:  Minor v, Happersett, Both parents must be U. S. Citizens.
http://fixamerica-fredmars.blogspot.com/2011/12/us-supreme-court-has-ruled-obama.html