Agustín Cosme Damián de Iturbide y Arámburu, commonly known as Agustín de Iturbide and later by his regnal name Agustín I, was the first Emperor of Mexico from 1822 until his abdication in 1823. An officer in the royal Spanish army, during the Mexican War of Independence he initially fought insurgent forces rebelling against the Spanish crown before changing sides in 1820 and leading a coalition of former royalists and long-time insurgents under his Plan of Iguala. The combined forces under Iturbide brought about Mexican independence in September 1821. After securing the secession of Mexico from Spain, Iturbide was proclaimed president of the Regency in 1821; a year later, he was proclaimed Emperor, reigning from 19 May 1822 to 19 March 1823, when he abdicated. In May 1823 he went into exile in Europe. When he returned to Mexico in July 1824, he was arrested and executed.
José Mariano Martín Buenaventura Ignacio Nepomuceno García de Arista Nuez was a Mexican soldier and politician who also became president of Mexico.
Guadalupe Victoria, born José Miguel Ramón Adaucto Fernández y Félix, was a Mexican general and politician who fought for independence against the Spanish Empire in the Mexican War of Independence and after the adoption of the Constitution of 1824, was elected as the first president of the United Mexican States. He was a deputy in the Mexican Chamber of Deputies for Durango and a member of the Supreme Executive Power following the downfall of the First Mexican Empire, which was followed by the 1824 Constitution and his presidency. He later served as Governor of Puebla.
Vicente Ramón Guerrero Saldaña was a Mexican military officer and statesman who became the nation's second president. He was one of the leading generals who fought against Spain during the Mexican War of Independence.
The Mexican Empire was a constitutional monarchy and the first independent government of Mexico. It was also the only former viceroyalty of the Spanish Empire to establish a monarchy after gaining independence. The empire existed from 1821 to 1823, making it one of the few modern-era independent monarchies in the Americas, alongside the Empire of Brazil (1822–1889) and the First Empire of Haiti (1804–1806).
In the history of Mexico, the Plan of Casa Mata was a plan formulated to elect a new constituent congress, which the monarchy of Agustín de Iturbide had dissolved in 1822. The Plan of Casa Mata sought to establish a republic.
Nicolás Bravo Rueda was a Mexican soldier and politician who served as interim President of Mexico three times, in 1839, 1842, and 1846. Previously, he fought in the Mexican War of Independence, and served as Mexico's first Vice President under President Guadalupe Victoria from 1824 until 1827, when he attempted to overthrow Victoria. He was also the fourth vice president under President Mariano Paredes in 1846, and served in the Mexican–American War.
Juan Nepomuceno Álvarez Hurtado de Luna, generally known as Juan Álvarez, was a general, long-time caudillo in southern Mexico, and president of Mexico for two months in 1855, following the liberals' ouster of Antonio López de Santa Anna. His presidency inaugurated the pivotal era of La Reforma.
Martín Carrera Sabat was a Mexican general, senator, and interim president of the country for about a month in 1855. He was a moderate Liberal.
Manuel María Lombardini de la Torre (1802-1853) was a Mexican soldier who served as president briefly for about three months in 1853. He rose to power in the wake of a revolution against the government of President Mariano Arista. After Arista and his successor Juan Ceballos resigned, the insurgents elevated Lombardini to the presidency as a matter of convenience, and he was only ever meant to serve as a placeholder while the true aim of the insurgents, the restoration of Santa Anna, was carried out. Lombardini would resign accordingly on April 20, and he died of pneumonia in December of the same year.
José Joaquín Antonio Florencio de Herrera y Ricardos was a Mexican statesman who served as president of Mexico three times, and as a general in the Mexican Army during the Mexican–American War of 1846–1848.
Valentín Gómez Farías was a Mexican physician and liberal politician who became president of Mexico twice, first from 1833 to 1834, during the period of the First Mexican Republic, and again from 1846 to 1847, during the Mexican–American War.
José Mariano Salas Barbosa was a Mexican soldier and politician who served twice as interim president of Mexico, once in 1846, during the Mexican American War, and once in 1859 during the War of Reform.
José Mariano Epifanio Paredes y Arrillaga was a Mexican conservative general who served as president of Mexico between December 1845 and July 1846. He assumed office through a coup against the liberal administration led by José Joaquín de Herrera. He was the grandfather of 38th Mexican President Pedro Lascuráin Paredes.
The Reform War, or War of Reform, also known as the Three Years' War, and the Mexican Civil War, was a complex civil conflict in Mexico fought between Mexican liberals and conservatives with regional variations over the promulgation of Constitution of 1857. It has been called the "worst civil war to hit Mexico between the War of Independence of 1810-21 and the Revolution of 1910-20." Following the liberals' overthrow of the dictatorship of conservative Antonio López de Santa Anna, liberals passed a series of laws codifying their political program. These laws were incorporated into the new constitution. It aimed to limit the political power of the executive branch, as well as the political, economic, and cultural power of the Catholic Church. Specific measures were the expropriation of Church property; separation of church and state; reduction of the power of the Mexican Army by elimination of their special privileges; strengthening the secular state through public education; and measures to develop the nation economically.
José Ventura Melchor Ciriaco de Ecay-Múzquiz y Arrieta was a Mexican soldier and politician who became the 5th President of Mexico after president Anastasio Bustamante stepped down to personally lead his armies against an 1832 insurgency known as the Plan of Veracruz.
Trinidad Anastasio de Sales Ruiz Bustamante y Oseguera was a Mexican physician, general, and politician who served as the 4th President of Mexico three times from 1830 to 1832, 1837 to 1839, and 1839 to 1841. He also served as the 2nd Vice President of Mexico from 1829 to 1832 under Presidents Vicente Guerrero, José María Bocanegra, himself, and Melchor Múzquiz. He participated in the Mexican War of Independence initially as a royalist before siding with Agustín de Iturbide and supporting the Plan of Iguala.
The First Mexican Republic, known also as the First Federal Republic, existed from 1824 to 1835. It was a federated republic, established by the Constitution of 1824, the first constitution of independent Mexico, and officially designated the United Mexican States. It ended in 1835, when conservatives under Antonio López de Santa Anna transformed it into a unitary state, the Centralist Republic of Mexico.
The Supreme Executive Power was the provisional government of Mexico that governed between the fall of the First Mexican Empire in April 1823 and the election of the first Mexican president, Guadalupe Victoria, in October 1824. After Emperor Iturbide abdicated, the sovereignty of the nation passed over to Congress, which appointed a triumvirate, made up of Guadalupe Victoria, Pedro Celestino Negrete, and Nicolas Bravo, to serve as the executive, while a new constitution was being written.
The Second Federal Republic of Mexico refers to the period of Mexican history involving a second attempt to establish a federal government in Mexico after the fall of the unitary Centralist Republic of Mexico in 1846 at the start of the Mexican-American War. It would last up until the Second French Intervention in Mexico led to the proclamation of the Second Mexican Empire in 1863.
Republicans
First Mexican Empire 
Imperial Army