Jed Rubenfeld, Professor of Law at Yale Law School, had an op-ed in Sunday’s Wall Street Journal in support of the concept of birthright citizenship. In it, he hung his hat on the “visitor” aspect of our Constitution’s 14th Amendment jurisdiction phrasing.

The 14th Amendment guarantees citizenship to everyone “born or naturalized in the United States, and subject to the jurisdiction thereof.” The opacity of the “jurisdiction” language allows reasonable people to land on either side of this issue. But in 19th-century legal usage, being “subject to the jurisdiction” of the US had a long-settled, straightforward meaning. As Chief Justice John Marshall explained in Schooner Exchange v McFaddon (1812), it meant being subject to US law.
Could you be prosecuted in an American court and imprisoned in an American jail for violating American law? If so, you were subject to US jurisdiction.

That “vulnerable to prosecution and jail” means “subject to US law” is at the core of the misunderstanding here (I’m eliding the question of whether a then-56-yr-old “settled meaning” remained settled after the 14th Amendment was ratified), including to birth tourism—whereby a pregnant woman enters the US for the express and sole purpose of giving birth on US soil so as to garner citizenship for her baby, after which the now-mother leaves with her baby to return to her home nation. Such “visitors,” while so subject, are not subject to US jurisdiction, but only to US government power and authority.

Birth tourists subject themselves only to some of our laws—that small subset of them that lets them enter our nation legally and then avail themselves of our medical-related duty of care laws. They otherwise remain within the control of their home nation laws and so retain the jurisdiction of their home countries, to which they fully intend to return as soon as they’re able to travel after giving birth. They’re holding themselves apart from and outside of our nation’s full and complete jurisdiction—which is what our 14th Amendment requires, even for birth tourists.

Illegal aliens go even farther: they hold themselves completely outside our jurisdiction by holding themselves completely outside our laws: they’ve disregarded our laws from the outset by their entering illegally. They render themselves subject only to the power of our government even as they, too, are subject prosecution and jail—or deportation.

This misunderstanding by Rubenfeld (and others) expands on the matter:

When a foreign army invades and conquers another country’s territory, that land becomes subject to the conquering country’s laws.

Not at all. That conquered territory becomes subject only to the conquering country’s power and ability to impose its laws. Even as long ago as Emer de Vattel, in his The Law of Nations, this was well understood.

The Left’s repeated ignoring of these simple facts does not make those facts nonexistent.

Unfortunately (cynically?), Rubenfeld, like others pushing this argument, leave wholly unaddressed those last.