He officially called for the overthrow of the government on 14 December 1845, at
San Luis Potosí City. He praised the former Spanish administration of the nation, painted a sorry picture of the Republic, and assured that this would be the last revolution, that he personally sought no office, and that a National Assembly would be installed in which all classes of society would be represented. His plan was ratified by the departmental assembly of
San Luis Potosí, and was met with support or at least indifference throughout the rest of the country. The Herrera government however, was able to muster so little support to defend itself that President Herrera gave up the struggle and resigned on 30 December 1845. Paredes and his forces entered the capital three days later. On 3 January Mariano Paredes finally ascended to the presidency. Paredes formed a new cabinet and proceeded to pass decrees against highwaymen, and for reducing the number of public offices. On 26 January 1846, an official government convocation was decreed summoning an extraordinary congress with the power to make constitutional changes. The congress was designed to be
corporatist. It was to be made up of 160 deputies, representing not geographical areas, but nine classes: land owners, merchants, miners, manufacturers, literary men, magistrates, public functionaries, clergy, and army, elected by the members of those classes.
Monarchical intrigues The Plan of San Luis Potosí had contained a clause declaring that the constitutional congress it called for should have no restrictions in its abilities to reconstitute the nation. This was widely perceived as opening the path to abolishing the republic and establishing a monarchy. Paredes had expressed
monarchist sentiments since 1832, opining that only a monarchy could prevent anarchy and protect the country against American ambitions. Hence with Paredes as president and an approaching constitutional convention, monarchists saw an opportunity to establish a Mexican throne. During the interval between Paredes' assumption of power and the meeting of the constituent congress, a propaganda war was waged between supporters of a monarchy and of a republic, the former through the newspaper
El Tiempo, edited by leading conservative intellectual
Lucas Alamán. In response to
El Tiempo and Paredes' perceived monarchism, many
Liberal Party newspapers changed their names to reflect their pro-republican stances.
El Monitor Constitucional (The Constitutional Monitor) changed its name to
El Monitor Republicano (The Republican Monitor).
El Siglo XIX (The Nineteenth Century) changed its name to
El Republicano (The Republican).
Carlos Maria Bustamante began to publish a newsletter titled
Mexico no quiere rey y menos a un extranjero, (Mexico doesn't want a king, let alone a foreign one). Republican critics also pointed out that monarchy was unsuitable to the country because Mexico had no
nobility to support such an institution. "With powerful arguments they maintained that the idea of a monarchy in Mexico was not only contrary to the wishes of the Mexican people, but also one that was not at all feasible, there being no such thing as a nobility in the country." Such arguments about the non-existence of a Mexican nobility were echoed by the Conservative statesman,
Antonio de Haro y Tamariz, who sarcastically suggested that the government start granting titles to generals. The perception that his administration was attempting to set up a monarchy led to strong opposition at a time when war threatened to break out with the United States at any moment. On 24 April, after the American invasion had already begun, Paredes issued a manifesto that he supported the republican form of government until the nation shall resolve upon a change. == Mexican–American War ==