United States v. Wong Kim Ark, 169 U.S. 649 (1898), was a landmark decision of the U.S. Supreme Court which held that "a child born in the United States, of parents of Chinese descent, who, at the time of his birth, are subjects of the Emperor of China, but have a permanent domicile and residence in the United States, and are there carrying on business, and are not employed in any diplomatic or official capacity under the Emperor of China", automatically became a U.S. citizen at birth. This decision established an important precedent in its interpretation of the Citizenship Clause of the Fourteenth Amendment to the Constitution.
Wong Kim Ark, who was born in San Francisco in 1873, had been denied re-entry to the United States after a trip abroad, under the Chinese Exclusion Act, a law banning virtually all Chinese immigration and prohibiting Chinese immigrants from becoming naturalized U.S. citizens. He challenged the government's refusal to recognize his citizenship, and the Supreme Court ruled in his favor, holding that the citizenship language in the Fourteenth Amendment encompassed the circumstances of his birth and could not be limited in its effect by an act of Congress.
The case highlighted disagreements over the precise meaning of one phrase in the Citizenship Clause—namely, the provision that a person born in the United States who is "subject to the jurisdiction thereof" acquires automatic citizenship. The Supreme Court's majority concluded that this phrase referred to being required to obey U.S. law; on this basis, they interpreted the language of the Fourteenth Amendment in a way that granted U.S. citizenship to children born of foreigners (a concept known as jus soli), with only a limited set of exceptions mostly based in English common law. The court's dissenters argued that being subject to the jurisdiction of the United States meant not being subject to any foreign power—that is, not being claimed as a citizen by another country via jus sanguinis (inheriting citizenship from a parent)—an interpretation which, in the minority's view, would have excluded "the children of foreigners, happening to be born to them while passing through the country". (Full article...)