Also known as: Estados Unidos Mexicanos, México, United Mexican States

Although the Spanish crown initially rejected O’Donojú’s recognition of Mexican independence, the date now recognized as that of separation from Old Spain is in fact August 24, 1821.

The first Mexican Empire spanned only a short transitional period during which Mexico became an independent republic. Independence from the former mother country had been the only glue which bound republicans and monarchists together, but, once that elusive goal had been achieved, the intrinsicanimosity between the two came to dominate the body politic.

Iturbide first became president of a council of regents, which convoked a congress to draw up a new constitution. Deputies to the congress represented the intendancies. When representatives from the Central American intendancies, part of the old viceroyalty of New Spain, declared that they did not wish to remain part of the Mexican Empire, they were allowed to withdraw and to organize their own governments.

On the evening of May 18, 1822, military groups in Mexico City proclaimed Iturbide Emperor Agustín I, and on the next day a majority in congress ratified the “people’s choice” and recommended that the monarchy be hereditary, not elective. Agustín I was crowned in a pompous ceremony on July 21. The empire was recognized by the United States on December 12, 1822, when the Mexican minister was officially received in Washington, D.C. But even then Agustín’s power and prestige were ebbing, and conflict soon developed between the military hero-emperor and the primarily civilian congress. On October 31, 1822, the emperor dismissed congress and ruled through an appointed 45-man junta. The act, condemned by many as arbitrary, provided a pretext to revolt. Among the rebel leaders was General Antonio López de Santa Anna, who would dominate Mexico’s political life for the next third of a century. In Veracruz, on December 2, 1822, Santa Anna proclaimed that Mexico should become a republic, a position supported by many rebels and liberal leaders. Agustín was forced to reconvene congress and to abdicate. In 1824 he returned from European exile but was arrested and shot. This first epoch of independent Mexican national life foreshadowed many problems of the developing republic.