Mexican War of Independence arm of the conspirators and in early 1821 he met Vicente Guerrero. Both proclaimed the Plan of Iguala, which called for the union of all insurgent factions and was supported by both the aristocracy and clergy of New Spain. It called for monarchy in an independent Mexico. Finally, the independence of Mexico was achieved on September 27, 1821. After that, the mainland of New Spain was organized as the Mexican Empire. This ephemeral Catholic monarchy changed to a federal republic in 1823, due to internal conflicts and the separation of Central America from Mexico. After some Spanish reconquest attempts, including
Declaration of Independence of the Mexican Empire Declaration of Independence of the Mexican Empire The Declaration of Independence of the Mexican Empire () is the document by which the Mexican Empire declared independence from the Spanish Empire. This founding document of the Mexican nation was drafted in the National Palace in Mexico City on September 28, 1821, by Juan José Espinosa de los Monteros, secretary of the Provisional Governmental Board. Three copies of the act were executed. One was destroyed in a fire in 1909. The other two copies are in the Museo Historico de Acapulco Fuerte de San Diego in Acapulco and in the General Archive