Citizenship and Naturalization: The Constitutional Structure
The Fourteenth Amendment’s Citizenship Clause sits at the foundation of modern U.S. nationality law. Its text is short:
“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.” (U.S. Const. amend. XIV, § 1.)
The clause does two distinct things in one sentence. It supplies a constitutional definition of who is a citizen, and it establishes a dual citizenship structure: every citizen is at once a citizen of the United States and of the particular state in which they reside. Both moves were doctrinally novel in 1868.
The pre-1868 structure
Before the Civil War, the Constitution did not define citizenship of the United States. The text used the term — “natural born Citizen,” “Citizen of the United States” — without specifying who qualified. Congress had not supplied a comprehensive statutory definition either. The matter was left to a combination of state-law citizenship rules, the common-law jus soli rule for persons born on U.S. soil (with notable exceptions), and the naturalization statutes Congress had enacted under the Article I power to “establish an uniform Rule of Naturalization.”
The result was a citizenship landscape with a primary state-level status (citizenship of Virginia, of New York) and a secondary, poorly-defined federal-level status that was broadly assumed to follow from state citizenship for most purposes. That structure collapsed in 1857 in Dred Scott v. Sandford, when the Supreme Court held that free Black persons born in the United States could not be citizens of the United States — a holding that severed state citizenship from federal citizenship for an entire class of people and made the absence of a clear federal definition an acute constitutional problem.
The Civil Rights Act of 1866 was Congress’s first response, declaring “all persons born in the United States and not subject to any foreign power” to be citizens of the United States. The Fourteenth Amendment, ratified two years later, raised the same substance to constitutional rank — both to ensure that subsequent Congresses could not undo the Civil Rights Act and to overturn Dred Scott on its constitutional ground.
What the Slaughter-House Cases said
The Supreme Court’s first sustained engagement with the Citizenship Clause came in the Slaughter-House Cases, 83 U.S. (16 Wall.) 36 (1873). The Court treated the dual federal/state structure as deliberate:
“It is quite clear, then, that there is a citizenship of the United States, and a citizenship of a State, which are distinct from each other, and which depend upon different characteristics or circumstances in the individual.”
The Court was equally clear that the 14th Amendment had supplied a new constitutional definition of federal citizenship rather than merely codifying a pre-existing one:
“To remove this difficulty primarily, and to establish a clear and comprehensive definition of citizenship which should declare what should constitute citizenship of the United States, and also citizenship of a State, the first clause of the first section was framed.”
“No such definition was previously found in the Constitution, nor had any attempt been made to define it by act of Congress.”
This is consequential. The historical case for treating federal U.S. citizenship as a 14A-created status — rather than a status the 14A merely recognized — has the Slaughter-House Court itself on its side, in apex precedent, in 1873. Whatever modern courts have done with the doctrine downstream, the structural observation about pre-1868 / post-1868 citizenship has primary- source support at the highest level.
The Court also tied the 13th and 14th Amendments together as a unified Reconstruction project. It described the underlying purpose as
“the freedom of the slave race, the security and firm establishment of that freedom, and the protection of the newly-made freeman and citizen from the oppressions of those who had formerly exercised unlimited dominion over him.”
The “package deal” framing of the Reconstruction Amendments — the 13th abolishing slavery, the 14th supplying the citizenship and equal-protection structure necessary to make abolition operative — is not a fringe historical reading. It is how the Court that construed those amendments contemporaneously understood them.
What the 14th Amendment did not do at apex level
Slaughter-House also famously narrowed the Privileges or Immunities Clause to a thin set of distinctively federal privileges — access to the federal seat of government, federal courts, sub-treasuries, the writ of habeas corpus, and federal protection abroad. Most substantive rights protection ended up running through the Due Process and Equal Protection Clauses instead, by judicial development over the next century and a half. That separate doctrinal story is not the subject of this concept page, but it explains why the dual-citizenship structure the Slaughter-House Court emphasized has done less analytical work in modern courts than its 1873 framing might suggest. The Privileges or Immunities Clause was the vehicle the dual structure was supposed to operate through; that vehicle substantially stalled.
The 14th Amendment as the modern operative source
In the century and a half since Slaughter-House, the apex Court has consistently treated 14A citizenship as the constitutional source of federal citizenship for U.S.-born persons. The most direct modern statement is Afroyim v. Rusk, 387 U.S. 253 (1967), which held that Congress cannot involuntarily strip a citizen of 14A citizenship — citizenship is “a citizenship the citizen keeps unless he voluntarily relinquishes it”:
“There is no indication in these words of a fleeting citizenship, good at the moment it is acquired but subject to destruction by the Government at any time.”
Afroyim’s holding is structurally significant for the present concept: it treats 14A citizenship as the unitary federal-citizen status, defended by the Constitution against governmental revocation, surrenderable only by the citizen’s voluntary renunciation. The modern doctrine does not entertain a separate, narrower category of “non-14A citizen” that one could keep while relinquishing 14A status. The 14A’s “All persons born or naturalized in the United States…are citizens of the United States” is the operative citizenship clause for federal-law purposes.
The naturalization-breadth question
A separate textual question runs alongside the citizenship structure. The Immigration and Nationality Act defines “naturalization” expansively at 8 U.S.C. § 1101(a)(23):
“The term ’naturalization’ means the conferring of nationality of a state upon a person after birth, by any means whatsoever.”
The phrase “by any means whatsoever” is genuinely broad statutory language. Read literally and in isolation, it could be made to include any government-conferred status that confers nationality in some sense — registration, certification, licensing, contractual relationships with federal agencies. The breadth of the “by any means whatsoever” formulation is the textual hook for a recurring family of arguments in alternate-citizenship theory: that ordinary administrative interactions with the federal government (Social Security number registration, driver’s license issuance under federally-conformed standards, tax-return filing) constitute “naturalization” in the statutory sense and create a contract-of-citizenship the individual can revoke.
The conventional reading, applied by every federal court that has considered such arguments, is narrower. “Naturalization” in § 1101(a)(23) is read against the statutory backdrop of the Immigration and Nationality Act — the formal Title III process of application, examination, oath of allegiance, and certificate issuance. The “by any means whatsoever” language is read as encompassing the various statutory pathways Congress has enacted (general naturalization, derivative naturalization through parents, collective naturalization by act, military- service naturalization), not as encompassing any government nexus that could colorably be described as “conferring nationality.”
The textual reading and the doctrinal reading diverge. The statute, read in isolation, has more breadth than the doctrinal application has been willing to give it. That divergence is a genuine constructionist observation. It is also — in the modern courtroom — foreclosed against the broad-reading party. The paired finding treats the operative-status question for federal-statute purposes, including IRC purposes specifically.
Why this concept page exists
Adverse Review’s foundational-claims series takes the structural premises of alternate-tax theory at the level of their primary-source support. The citizenship and naturalization structure is the substrate on which the 26 U.S.C. § 7701(b)(1)(B) “citizen of the United States” determination operates — and without an honest treatment of the constructionist case for the dual-citizenship reading, the IRC-operative analysis floats free of the underlying constitutional history.
This concept lays out the structure. The verdict on the operative- status question — whether IRC § 7701(b)(1)(B)’s “citizen of the United States” reaches every U.S. citizen, or only some narrower category — is treated in the paired finding linked above. This concept page also pairs with the Brushaber essay and the ’nonresident alien’ concept, which together resolve the IRC’s individual-taxpayer status question.
The historical material is rich enough — pre-14A citizenship doctrine, the Reconstruction Amendments as a package, Dred Scott and Slaughter-House, the post-Slaughter-House narrowing of Privileges or Immunities, the modern Afroyim line — to support a full essay treatment in a future cycle. The present concept is the textual orientation; the historical and analytical depth is held over for separate development.