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Dual nationality, the Supreme Court has explained, is "a status long recognized in the law." Kawakita, 343 U.S. at 723. See also id. at 734 ("Dual nationality . . . is the unavoidable consequence of the conflicting laws of different countries. One who becomes a citizen of this country by reason of birth retains it, even though by the law of another country he is also a citizen of it.") (citation omitted); Savorgnan, 338 U.S. at 500 (although "[t]he United States has long recognized the general undesirability of dual allegiances[,] . . . [t]emporary or limited duality of citizenship has arisen inevitably from differences in the laws of the respective nations as to when naturalization and expatriation shall become effective"); Elg, 307 U.S. at 329 ("As municipal law determines how citizenship may be acquired, it follows that persons may have a dual nationality."). The mere assertion by an individual of citizenship in one country thus need not manifest an intention to relinquish citizenship in another country, for "[t]he concept of dual citizenship recognizes that a person may have and exercise rights of nationality in two countries and be subject to the responsibilities of both. The mere fact that he asserts the rights of one citizenship does not without more mean that he renounces the other." Kawakita, 343 U.S. at 723-24.

Most interesting...first use of "natural born citizen" in this lengthy article...
For example, in Terrazas v. Haig, 653 F.2d 285 (7th Cir. 1981), the Seventh Circuit concluded that Laurence Terrazas, a U.S. natural born citizen who had also acquired Mexican citizenship at birth by virtue of his father's Mexican citizenship, had adequately manifested an intention to renounce when, at age 22, he executed an application for a certificate of Mexican nationality. Id. at 286.

Did his Father naturalize to become a US citizen while still maintaining his Mexican citizenship???

Long recognized law my A$$. Only to those who consider legislating from the bench legal. They also misconstrue the Elg case. Elg was born to 2 citizen parents, she was not born a dual citizen and in fact; in the Elg case dicta(deciding opinion) the court clearly states that none but one born owing single allegiance to the United States(born to 2 citizen parents) can be president.