... any person who, while a citizen of the United States and during the existing war in Europe, entered the military or naval service of any country at war with a country with which the United States is now at war, who shall be deemed to have lost his citizenship by reason of any oath or obligation taken by him for the purpose of entering such service, may resume his citizenship by taking the oath of allegiance to the United States prescribed by the naturalization law and regulations; ... such oath to be taken here or abroad, before any state or Federal court authorized to naturalize aliens, or before any United States consul. CITIZENSHIP TAKES NO ACCOUNT OF SEX Basic citizenship in the United States takes no account of sex. _Every_ child, male or female, white, black, brown, red, or yellow, “born in the United States and subject to the jurisdiction thereof,” is _ipso facto_ a citizen. And every unmarried woman of that nativity is, and continues to be such, as long as she remains unmarried. Upon marriage she takes forthwith, whether she will or no, so far as our law is concerned, the nationality of her husband--even if he be an alien. It is the unbroken tradition of our law, and of the laws of nearly all other nations--in so far as they recognize women as being individual citizens at all--that the nationality of a wife follows that of her husband. Of that tradition was born a section of the law of 1907 which seeks to confer upon any American woman marrying a foreigner the nationality of her husband. When an alien man becomes a citizen of the United States by naturalization, his wife, in ordinary circumstances, becomes a citizen with him; the law says specifically that “a woman who is now, or may hereafter be married to a citizen of the United States, and who might herself be lawfully naturalized, may be deemed a citizen.” But, generally speaking, she must, unless herself American born, be resident in this country. The practice in this regard has not been wholly consistent; the State Department has held repeatedly that the naturalization of a husband does not reach the wife if she continue to reside in the old country; but a very uniform line of decisions is to the effect that her husband’s naturalization makes her a citizen wherever she may be, and that she remains a citizen even after his death unless she takes action to repatriate herself. The Act of 1907 makes it necessary for such a foreign-born widow resident abroad to register with a United States consul within a year after the termination of her marriage; otherwise her citizenship lapses.