I offer Rogers v. Bellei, 401 U.S. 815 (1971)
Although those Americans who acquire their citizenship under statutes conferring citizenship on the foreign-born children of citizens are not popularly thought of as naturalized citizens, the use of the word "naturalize" in this way has a considerable constitutional history. Congress is empowered by the Constitution to "establish an uniform Rule of Naturalization," Art. I, S: 8. Anyone acquiring citizenship solely under the exercise of this power is, constitutionally speaking, a naturalized citizen. The first congressional exercise of this power, entitled "An Act to establish an uniform Rule of Naturalization," was passed in 1790 ...
I wouldn’t want to bet the farm on how Sotomayor, Breyer, Kagan, Kennedy, Ginsberg, and Roberts would decide this one.