Repealing birthright citizenship is a terrible idea. It will unquestionably jeopardize the electoral future of the GOP by alienating Hispanics—the largest minority and fastest-growing segment of the U.S. population. More importantly, ending birthright citizenship would fundamentally change what it means to be an American.
Proponents of repeal argue that the 14th Amendment was passed after the Civil War to guarantee citizenship to freed slaves, and that it was never intended to grant rights to the offspring of illegal aliens. But this argument is a non sequitur. At the time of the adoption of the amendment, there was no category of "illegal alien" because immigration was unrestricted and unregulated. If you secured passage to the United States, or simply walked across the open border with Mexico or Canada, you could stay permanently as a resident alien or apply to be naturalized after a certain number of years. And if you happened to give birth while still an alien, your child was automatically a citizen—a right dating back to English common law.
She cites the 1898 case of U.S. v. Wong Kim Ark:
The court found that the only persons Congress intended to exclude from birthright citizenship under the 14th Amendment were children born to diplomats—an ancient, universally recognized exception even under common law; Indians, who by treaty were considered members of sovereign nations; and children of an occupying enemy. "The amendment, in clear words and in manifest intent, includes the children born within the territory of the United States of all other persons, of whatever race or color, domiciled within the United States," wrote Justice Horace Gray for the majority. To hold otherwise, he noted, would be to deny citizenship to the descendants of English, Irish, Germans and other aliens who had always been considered citizens even if their parents were citizens of other countries. For more than a 100 years, the court has consistently upheld this analysis.
Here’s the crux of the dispute. The text of the Fourteenth Amendment’s Citizenship Clause provides that “All persons born or naturalized in the United States and subject to the jurisdiction thereof, are citizens of the United States and of the State wherein they reside.” That text has two requirements: 1) Birth on U.S. soil; and 2) Being subject to the jurisdiction of the United States when born. In recent decades, the opinion has taken root, quite erroneously, that anyone born in the United States (except the children of ambassadors) is necessarily subject to its jurisdiction because everyone has to comply with our laws while physically present within our borders. Those who drafted and ratified the Fourteenth Amendment had a different understanding of jurisdiction. For them, a person could be subject to the jurisdiction of a sovereign nation in two very different ways: the one, partial and territorial; the other full and complete. Think of it this way. When a tourist from Great Britain visits the United States, he subjects himself to our “territorial jurisdiction.” He has to follow our laws while he is here, including our traffic laws that require him to drive on the right rather than the wrong (I mean left!) side of the road. He is no longer subject to those laws when he returns home, of course, and he was never subject to the broader jurisdiction that requires from him allegiance to the United States. He can’t be drafted into our army, for example, or prosecuted for treason for taking up arms against us.