Then we must ask if the law itself is constitutional. The Civil Rights Act of 1866 was passed into law two years before the Citizenship Clause of the Fourteenth Amendment became the law of the land upon the ratification of the amendment. So, the Civil Rights Act of 1866 technically was not required to fall under the provisions of the Citizenship Clause at the time of its passing because the Fourteenth Amendment did not exist, yet. The Citizenship Clause, however, since it is a constitutional amendment, supersedes the law passed two years before it, and the only way the Civil Rights Act is still valid law is if it is consistent with the Citizenship Clause.
So, we need to determine if the Citizenship Clause is consistent with the Civil Rights Act of 1866, and what the language of the clause in the Fourteenth Amendment truly means. This, unfortunately, is typically determined by a plain reading of the text. But the textualist interpretation is not consistent with true constitutional law. If we want to determine the original intent of the clause, we need to dig into original documents and notes regarding the clause. To do this, we must examine the congressional testimony of Senators Howard and Trumbull, the primary writers of the Citizenship Clause.
During congressional testimony on May 23, 1866, Senator Jacob Howard said, “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…” On May 30, 1866, Senator Lyman Trumbull said, “What do we mean by ‘subject to the jurisdiction of the United States’? Not owing allegiance to anybody else. That is what it means.”
Trumbull then clarified that the Civil Rights Act of 1866 and the Fourteenth Amendment were aligned: “The provision is simply declaratory of what I regard as the law of the land already, that 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…Subject to the jurisdiction means complete jurisdiction; not a partial or temporary one.”