You are playing fast and loose with the language of the Citizenship Claus - "subject to the jurisdiction of the United States". Specifically, that excludes the children or foreign diplomats. The author of the provision you cite was Senator Jacob Howard, who wrote: "...every person born within the limits of the United States, and subject to their jurisdiction, is by virtue of natural law and national law a citizen of the United States. "This will not, of course, include persons born in the United States who are foreigners, aliens, who belong to the families of ambassadors or foreign ministers accredited to the Government of the United States, but will include every other class of persons.” The only Supreme Court case in this matter was over the children of Chinese workers, imported to build the Transcontinental Roailroad. They were US citizens, because, specifically, they were legal immigrants. Historically, only the offspring of legal immigrants are citizens.