Mexico's cessation framework for nationality and citizenship is one of the most architecturally clear in the T1+ cohort. Unlike Turkey (where cessation involves KHK decree-type discrimination, multiple statutes, and parallel OHAL structures) or Armenia (where Soviet-era and post-dissolution instruments interact), Mexico operates a single-statute, single-regulation, single-federal-authority cessation system anchored in CPEUM Art 37 (three Apartados: A, B, C) and operationalized by Ley de Nacionalidad 1998 Arts 27-32 with Reglamento DOF 2009-06-17 Art 22.

Apartado A — Mexicanos por NACIMIENTO: absolute shield. "Ningún mexicano por nacimiento podrá ser privado de su nacionalidad." The state cannot involuntarily deprive a mexicano por nacimiento of their nationality under any circumstances. The only loss mechanism for this group is the voluntary Art 17 renuncia (MX-RST-02).

Apartado B — Mexicanos por NATURALIZACIÓN: two cessation grounds. (i) Voluntary acquisition of a foreign nationality; (ii) 5-year continuous residence abroad. These are the operative loss grounds for naturalized Mexicans and are implemented by Ley Arts 27-32 and Reglamento Art 22.

Apartado C — CIUDADANÍA (citizenship, distinct from nationality): six grounds for loss of political citizenship rights, separate from nationality status. Modified by DOF 2013-09-30 reform (transferring authorization for grounds II, III, and IV from Senate/Comisión Permanente to Ejecutivo Federal).

The due process anchor is the IACtHR Ivcher Bronstein v Perú (2001) standard, applied to Mexico via Pacto de San José (MX accepted compulsory ICJ jurisdiction 1998-12-16). Any cessation procedure for naturalized Mexicans must comply with: notification, statement of reasons, hearing, legal assistance, motivated decision, and judicial review.

Apartado B — Loss of naturalized Mexican nationality (2 grounds):

• Ground 1: Voluntary acquisition of a foreign nationality after naturalization
• Ground 2: Five years of continuous residence abroad without returning to Mexico

Apartado C — Loss of citizenship (political rights only; 6 grounds):

• I. Acceptance of foreign titles of nobility that imply submission to a foreign government
• II. Official service (cargo oficial) to a foreign government without permit from Ejecutivo Federal
• III. Acceptance of foreign decorations without permit from Ejecutivo Federal
• IV. Performance of foreign titles, functions, or representative roles without Ejecutivo Federal permit
• V. Aiding a foreign state against the nation ("ayudar contra la nación")
• VI. Other cases established by law (clause residual)

1. SRE-DGAJ initiates cessation procedure upon information that a naturalized Mexican has voluntarily acquired a foreign nationality or established 5-year continuous residence abroad
2. Notification to affected person: 15 días hábiles minimum notice (Reglamento Art 22 I)
3. Opportunity to respond + submit evidence + be heard
4. SEGOB issues opinion (45 días hábiles)
5. SRE-DGAJ issues motivated decision (fundación y motivación per CPEUM Art 16)
6. Appeal: amparo indirecto before Juzgado de Distrito; further to collegiate circuit court and SCJN
7. Due process standard: IACtHR Ivcher Bronstein v Perú (2001) — notification, reasons, hearing, legal assistance, motivated decision, judicial review — all required

Filing authorities: SRE-DGAJ (exclusive — Art 31 Reglamento); SEGOB (opinion 45 días hábiles). MX procedure (CES): SRE-DGAJ + RENAPO + Registro Civil estatal operational; CPEUM Art 30/32/37 + Ley de Nacionalidad 1998 (última reforma DOF 2012-04-23) + Reglamento DOF 2009-06-17 framework; CURP Biométrica reform DOF 2025-07-16.

• Primary statute: CPEUM Art 37 Apartado A (non-deprivation por nacimiento) + Apartado B (pérdida naturalización: 2 causales) + Apartado C (pérdida ciudadanía: 6 causales; DOF 2013-09-30 última reforma)
• Implementing statute: Ley de Nacionalidad 1998 Arts 27-32 (Cap IV Causas de pérdida)
• Regulation: Reglamento DOF 2009-06-17 Art 22 (procedural cessation framework)
• Reform arc: Art 37 3-reform chain: (1) DOF 1934-01-18; (2) DOF 1997-03-20 creating Apartados A + B + C; (3) DOF 2013-09-30 modifying Apartado C authorization (Senate → Ejecutivo Federal)
• Due process: IACtHR Ivcher Bronstein v Perú (2001) via Pacto San José (MX compulsory jurisdiction 1998-12-16)
• Operative period: 1998-03-20 → present (post-1997 reform EIF)
• Authority: SRE-DGAJ (exclusive per Reglamento Art 31); SEGOB (opinion — 45 días hábiles); Ejecutivo Federal (Apartado C permisos post-2013)

Primary statute: CPEUM Art 37 Apartado A (non-deprivation mexicano por nacimiento) + Apartado B (pérdida mexicano por naturalización: 2 causales — adquisición voluntaria foreign nationality OR 5y residence abroad) + Apartado C (pérdida ciudadanía: 6 causales) + Ley Nacionalidad 1998 Arts 27-32 + Reglamento 2009 Art 22. Operative period: 1998-03-20 → 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.