When did the SC rule that?
Several times. U.S. v. Wong Kim Ark, Perkins v. Elg, Elk v. Wilkins, Lynch v. Clark are all Supreme Court cases. Town v Town is a Connecticut court case. In Re Look Tin Sing was a west coast Circuit Court case. All state that persons born in the U.S. are citizens - the term used being native born or natural born, depending on the case. And since the Constitution recognizes only two forms of citizenship - natural born and naturalized - then native born and natural born are synonymous.