CPEUM 1917 Constitution — LONGEST CONTINUOUSLY-OPERATIVE SINGLE-TEXT CONSTITUTION WORLDWIDE

The Constitución Política de los Estados Unidos Mexicanos (CPEUM) was promulgated on 1917-02-05 by the Constituent Congress of Querétaro and entered into force the same day. As of 2026-05-17, it has been continuously in force for 109 years without re-promulgation or replacement — making it the longest-running single constitutional text in the world that has not been replaced by a new constitution.

The characterization requires precise framing. The US Constitution (1788) is older by text, but it is typically compared as a static foundational document with 27 amendments over 235 years. Norway's Grunnlov (1814) is older by date. What makes Mexico's 1917 CPEUM the in this cohort is the specific combination: (a) continuous operative force without replacement or suspension since 1917, (b) through more than 700 amendments that have updated the document to reflect modern constitutional values while preserving the single-text continuity, and (c) within a Latin American civil-law constitutional tradition where other major constitutions have been replaced entirely (BR 1988, AR multiple amendments to 1853, CL 1980 + 2022 failed replacement attempt).

The CPEUM's direct relevance to this knowledge base is as the foundational anchor for every nationality and citizenship provision documented across all 50 routes: Art 30 (acquisition of Mexican nationality), Art 31 (duties of Mexican citizens), Art 32 (nationality reservations for public office), Art 34 (definition of ciudadano mexicano), Art 35 (rights of citizens), Art 36 (duties of citizens), Art 37 (loss of nationality and citizenship), and Art 73 fr XVI (federal exclusive jurisdiction over nationality). Every statute, regulation, and treaty documented in this knowledge base operates under the constitutional supremacy established by CPEUM Art 133.

Amendment volume: Over 700 amendments since 1917 (Cámara de Diputados compilación as of May 2026). The 2011 human rights constitutional reform package (42 articles; Decreto DOF 2011-06-10) was the most comprehensive single amendment in the CPEUM's history, elevating international human rights treaty obligations to constitutional rank and introducing the pro persona principle. The 2024 Indigenous reform (DOF 2024-09-30) was the most recent major reform affecting nationality-adjacent provisions.

• Primary document: Constitución Política de los Estados Unidos Mexicanos — promulgated 1917-02-05 by Constituent Congress of Querétaro; 109 years continuously in force as of 2026-05-17; operates through 700+ amendments without re-promulgation
• Key nationality articles: Arts 30, 31, 32, 34, 35, 36, 37, 73 fr XVI, 133
• Authority: SCJN (constitutional interpretation); Congreso de la Unión + Asambleas Legislativas de las Entidades Federativas (amendment procedure per Art 135)
• Amendment procedure: Art 135 — simple majority of Congreso de la Unión + approval of majority of state legislatures; no referendum required; promulgation by Ejecutivo Federal

Primary statute: Constitución Política de los Estados Unidos Mexicanos — promulgated 1917-02-05 by Constituent Congress of Querétaro; 109 years continuously in force as of 2026-05-16; operates through 700+ amendments without re-promulgation. Operative period: 1917-02-05 → present. Mexican citizenship legal framework: Constitución Política de los Estados Unidos Mexicanos (CPEUM) Art 30, 32, 37 primary constitutional framework — Art 30 nationality acquisition (Apartado A jus soli + Apartado B jus sanguinis); Art 32 dual-citizenship + Mexican-by-naturalization restrictions; Art 37 ciudadanía + nacionalidad loss framework. Constitutional anchor: CPEUM is the longest-continuous-single-text constitution globally (since 1917-02-05); Apartado A fracción I textually preserved across reforms 1934/1969/1974/1997/2021. Implementing statute: Ley de Nacionalidad 1998 (DOF 1998-01-23; última reforma DOF 2012-04-23). Implementing regulation: Reglamento de la Ley de Nacionalidad DOF 2009-06-17 (Calderón sexenio — NOT 2014). Key recent reforms: Art 30 multi-generational jus sanguinis reform DOF 2021-05-17 (Sheinbaum-era); Indigenous Originario framework DOF 2024-09-30 reforming Art 2 + 27 + 73 (CPEUM); Oaxaca Usos y Costumbres 417-418 SNI framework. Treaty anchors: ILO 169 (Mexico 2nd globally ratifier, 1990-09-05 after Norway 1990-06-19); 1933 Montevideo denuncia trifecta (1997-2000 — Inter-American Citizenship Treaties withdrawal); ICJ Avena 2004 (Mexico v USA — consular notification); Treaty of Guadalupe Hidalgo 1848 (territorial cession + nationality transition framework). NOT party to 1961 Stateless Convention. Apex: Suprema Corte de Justicia de la Nación (SCJN) — Pleno + Primera Sala + Segunda Sala. Indigenous parallel framework distinct.

-: CPEUM 1917 DOF compilation (SCJN oficial) -: CPEUM texto vigente (Cámara de Diputados — all reforms to current date) -: RENAPO/INEGI/Art 4 identity framework -: Ley de Nacionalidad 1998 — primary implementing statute under CPEUM -: DOF 1934-01-18 Art 30 reforma (first major nationality reform under CPEUM)

Source pins:,. MX source register: T1 primary: CPEUM (Constitución Política de los Estados Unidos Mexicanos) DOF publication; Ley de Nacionalidad 1998 (DOF 1998-01-23, última reforma DOF 2012-04-23); Reglamento de la Ley de Nacionalidad DOF 2009-06-17 (Calderón); SCJN sentencias + AI (acciones de inconstitucionalidad) + AR (amparo en revisión) + ADR (amparo directo en revisión); SRE-DGAJ Dirección General de Asuntos Jurídicos; RENAPO Registro Nacional de Población; DOF Diario Oficial de la Federación. T2 corroborating: INE + Consulados de México publications; UN Treaty Collection treaty-status; ILO ratifications database; ICJ Avena 2004 judgment. Cross-border (cohort-distinct): Spain Ley 36/2002 + Italy Legge 74/2025.