| 24 Feb 1821 |
the establishment of New Spain as an independent empire is proposed in the Plan of Iguala (Plan de Iguala), a plan of government issued at Iguala on 24 Feb 1821 by Agustín de Iturbide (Gaceta Imperial de México, No. 11, 20 Oct 1821, pp. 81-82; Gaceta Imperial, No. 12, 23 Oct 1821, pp. 83-84) |
| 24 Aug 1821 |
in view of the proposal for the independence of New Spain, a part of North America in possession of the Spanish monarchy is recognized as a sovereign and independent nation under the name of the Mexican Empire (Imperio Mexicano), in accordance with a treaty signed at Córdoba on 24 Aug 1821 by the Superior Political Chief of the Province of New Spain (Jefe político superior de la provincia de Nueva España) and the First Chief of the Mexican Imperial Army of the Three Guarantees (Primer Jefe del Ejército Imperial Mexicano de las Tres Garantías) (Gaceta Imperial, No. 12, 23 Oct 1821, pp. 85-89) |
| 24 Aug 1821 - 29 Mar 1823 |
Imperio Mexicano |
| 28 Sep 1821 |
the Declaration of Independence of the Empire (Acta de Independencia del Imperio) is approved by the Provisional Governing Junta (Junta Provisional Gubernativa) at the meeting held in Mexico City on 28 Sep 1821 and signed by the members of the Junta on the same day (Gaceta Imperial, No. 8, 16 Oct 1821, pp. 53-54; Provisional Governing Junta Journal 1821-1822, pp. 9-10) |
| 29 Mar 1823 |
the executive authority, which had existed since 19 May 1822 as the imperial government, is terminated in accordance with a resolution of the Constituent Congress (Congreso Constituyente) (Constituent Congress Minutes 1823, p. 90) |
