Indeed, during debate over the amendment, Senator Jacob Howard, the author of the citizenship clause, attempted to assure skeptical colleagues that the language was not intended to make Indians citizens of the United States. Indians, Howard conceded, were born within the nation’s geographical limits, but he steadfastly maintained that they were not subject to its jurisdiction because they owed allegiance to their tribes and not to the U.S. Senator Lyman Trumbull, chairman of the Senate Judiciary Committee, supported this view, arguing that “subject to the jurisdiction thereof” meant “not owing allegiance to anybody else and being subject to the complete jurisdiction of the United States.”

Jurisdiction understood as allegiance, Senator Howard explained, excludes not only Indians but “persons born in the United States who are foreigners, aliens, [or] who belong to the families of ambassadors or foreign ministers.” Thus, “subject to the jurisdiction” does not simply mean, as is commonly thought today, subject to American laws or courts. It means owing exclusive political allegiance to the U.S.

Furthermore, there has never been an explicit holding by the Supreme Court that the children of illegal aliens are automatically accorded birthright citizenship. In the case of Wong Kim Ark (1898) the Court ruled that a child born in the U.S. of legal aliens was entitled to “birthright citizenship” under the Fourteenth Amendment. This was a 5–4 opinion which provoked the dissent of Chief Justice Melville Fuller, who argued that, contrary to the reasoning of the majority’s holding, the Fourteenth Amendment did not in fact adopt the common-law understanding of birthright citizenship.