Oh, so that's why Wong Kim Ark lost his case and was denied citizenship by the Supreme Court! Because there were Congressional statutes at the time—and even a treaty with China‐that prohibited the children of Chinese nationals from becoming US citizens!
You're so brilliant, Kansas58. You have opened my eyes so that I can finally understand why the Supreme Court decided than Wong Kim Ark was not a citizen, in spite of what the 14th Amendment says. The silly Amendment was overruled by Congressional statute. How obvious it should have been.
Wong Kim Ark won, he did not lose his case!
http://en.wikipedia.org/wiki/United_States_v._Wong_Kim_Ark
BTW, a Treaty on Citizenship, with another Country, would be the Law of the Land. The Constitution can be altered by Treaty, in many cases.
(Obama knows this, and this is why Obama and Holder wanted a Treaty with Mexico, to restrict gun rights!)