
Independence, Reform and the lost north
Eleven years of war for independence, an empire and then a republic, the loss of more than half the territory to the USA, the Reform that took on the wealth of the Church, and the French. This room gathers what our 32 state histories hold for the era, 114 dated events and 50 places.
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The era in 26 dates
- 13 Sep 1810The Querétaro conspiracy, which met at the home of Josefa Ortiz de Domínguez, is betrayed; she gets a warning through to the conspirators, and the rising is brought forward. 18
- 16 Sep 1810Miguel Hidalgo, parish priest of Dolores, calls his parishioners to rise: the War of Independence begins. 12
- 28 Sep 1810Hidalgo's army takes the Alhóndiga de Granaditas, the granary of Guanajuato where the city's Spaniards had shut themselves in. 2
- 6 Dec 1810Hidalgo issues a decree abolishing slavery. 3
- 30 Jul 1811Captured at the Wells of Baján in March, Hidalgo is shot by a firing squad. José María Morelos carries the war on in the south. 32
- 1813Leona Vicario, who funds the insurgents from her own fortune and sends them news from Mexico City, is found out, held and questioned; she names no one, and insurgents rescue her. She writes for the insurgent newspapers, one of Mexico's first women journalists. 4
- 6 Nov 1813The Congress of Chilpancingo, called by Morelos, declares independence; Morelos's Sentiments of the Nation set out its programme. 5
- 22 Dec 1815Morelos, captured in November, is shot at San Cristóbal Ecatepec. The rising narrows to guerrilla bands in the south, Vicente Guerrero's among them. 56
- 24 Feb 1821Agustín de Iturbide, a royalist officer, joins Guerrero under the Plan of Iguala. The Army of the Three Guarantees enters Mexico City on 27 September, and the Act of Independence is signed the next day. 26
- 21 Jul 1822Iturbide, proclaimed emperor in May by a Congress under pressure from his troops, is crowned Agustín I. He abdicates on 19 March 1823, and Central America leaves on 1 July. 7
- 4 Oct 1824The Constitution makes Mexico a federal republic, with 19 states. 8
- Sep 1829President Vicente Guerrero abolishes slavery (an exemption is then made for Texas); the same year, a Spanish attempt to reconquer Mexico is beaten at Tampico. 69
- 2 Mar to 21 Apr 1836Texas declares independence; the Mexican army takes the Alamo on 6 March and is beaten at San Jacinto on 21 April. Mexico refuses to recognise the Republic of Texas. 9
- 13 May 1846The USA, which annexed Texas on 29 December 1845, declares war after a clash on 25 April; its army takes Mexico City in September 1847. 10
- 30 Jul 1847Maya rebels attack Tepich and the Caste War of Yucatán begins; it costs an estimated 40,000 to 50,000 lives. 12
- 2 Feb 1848The war ends with the Treaty of Guadalupe Hidalgo: Mexico loses more than half its territory, Texas included, and the USA pays US$15 million. 10
- 30 Dec 1853Santa Anna sells La Mesilla, 76,800 km² south of the Gila by the published count, to the USA for US$10 million: the Gadsden Purchase. 11
- 1854 to 1856The liberal revolt of the Plan of Ayutla brings down Santa Anna. The Juárez Law (23 November 1855) curbs the special courts of the clergy and the army; the Lerdo Law (June 1856) forces corporations, the Church and the Indigenous communities among them, to sell their land. 13
- 5 Feb 1857A liberal constitution is promulgated. The conservatives answer with the Plan of Tacubaya on 17 December, and the Reform War begins. 13
- 12 Jul 1859The liberal government, at war, nationalises the property of the Church. 13
- 11 Jan 1861Benito Juárez enters Mexico City: the liberals have won the Reform War. 13
- 5 May 1862After Juárez suspends payments on the foreign debt (July 1861), Britain, Spain and France land troops under the Convention of London; Britain and Spain withdraw, France marches inland, and the Mexican army beats it at Puebla. 14
- 10 Jun 1863The French occupy Mexico City; Maximilian of Habsburg accepts the crown and lands at Veracruz in the summer of 1864. 14
- 19 Jun 1867With the French gone, Maximilian is shot with generals Miramón and Mejía on the Cerro de las Campanas, outside Querétaro; Juárez re-enters the capital on 15 July. 1415
- 18 Jul 1872Juárez, a Zapotec from San Pablo Guelatao and president since 1858, dies in office. 15
- 1876Porfirio Díaz rises under the Plan of Tuxtepec (January) and enters Mexico City on 29 November: the next era begins. 17
What happened, and what is still argued
- Mexico today44.2%1,958,000 km²
- Texas, to the Rio Grande: broke away in 1836, annexed by the USA in 1845, given up in 184822.4%993,000 km²
- Ceded in 1848: Alta California, New Mexico and the lands between31.2%1,382,000 km²
- La Mesilla, sold in 18532.1%94,000 km²
See it on the map: the territory room →
Sources: 1011 · areas from the territory room, which lists its own sources
Data table
| Piece | km² | % |
|---|---|---|
| Mexico today | 1,958,000 km² | 44.2% |
| Texas, to the Rio Grande: broke away in 1836, annexed by the USA in 1845, given up in 1848 | 993,000 km² | 22.4% |
| Ceded in 1848: Alta California, New Mexico and the lands between | 1,382,000 km² | 31.2% |
| La Mesilla, sold in 1853 | 94,000 km² | 2.1% |

Eleven years of war
The war that began at Dolores in 1810, brought forward when Josefa Ortiz de Domínguez warned the Querétaro conspirators, was first a mass rising led by two priests, Hidalgo and then Morelos, who also abolished slavery and called for an end to the castes. Both were shot. Leona Vicario paid for the insurgents, carried their letters and wrote their newspapers.
Two of its leaders may have had African forebears: Morelos's father's line included Africans, though his baptism called him a Spaniard, and some historians suggest African heritage for Vicente Guerrero, whose origins are debated.
By 1816 the rising was reduced to guerrillas such as Vicente Guerrero's. Independence came in 1821, when a royalist officer, Agustín de Iturbide, changed sides and joined Guerrero under the Plan of Iguala.
An empire, then a republic
Proclaimed emperor in May 1822 by a Congress under pressure from his troops, Iturbide lasted ten months; Central America, which had joined the empire, left in 1823. The Constitution of 1824 made Mexico a federal republic of 19 states.
Guerrero, president in 1829, abolished slavery that September (an exemption was then made for Texas), and the republic beat back a Spanish attempt at reconquest at Tampico. Coups and short presidencies followed for decades.
The lost north
Texas broke away in 1836 and Mexico never recognised it. The USA annexed it in 1845 and went to war in 1846; its army took Mexico City in September 1847.
By the Treaty of Guadalupe Hidalgo, in 1848, Mexico gave up more than half of its territory, Texas included, for US$15 million. In 1853 Santa Anna sold La Mesilla for US$10 million more. The chart above sets the pieces against the Mexico of 1821; the territory room draws them on the map.
The Caste War
In July 1847, while the USA army marched on the capital, Maya rebels in Yucatán attacked Tepich. The Caste War cost an estimated 40,000 to 50,000 lives. From 1850 the rebels of the southeast followed the Talking Cross, and their country held out into the next era.
Sources: 12
The Reform
The liberals who brought down Santa Anna in 1854 set out to end the old corporate order. The Juárez Law curbed the special courts of the clergy and the army; the Lerdo Law forced the Church and the Indigenous communities to sell their lands, which later fed the great estates. The Constitution of 1857 followed.
The conservatives rose, and the Reform War ran from December 1857 to January 1861. In July 1859, in the middle of it, the liberal government nationalised the property of the Church.
The French, and Juárez
When Juárez suspended payments on the foreign debt in 1861, Britain, Spain and France landed troops; the other two withdrew, and France invaded. Mexico won at Puebla on 5 May 1862, but the French took the capital in 1863 and set Maximilian of Habsburg on a throne. When the French troops left, the empire fell: Maximilian was shot at Querétaro in June 1867.
Juárez, a Zapotec from the Oaxaca sierra, governed until his death in 1872. Four years later Porfirio Díaz took power by force.
All 114 dated events of the era in our 32 state histories
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The full list, oldest first. Each state name opens its history, where the event carries its source.
See all 114 events
- 1810JaliscoIn Guadalajara, Hidalgo decrees the abolition of slavery on 29 Nov and 6 Dec.
- 1810NayaritJosé María Mercado takes Tepic in Nov and San Blas in Dec for the insurgency.
- 1810QuerétaroThe Querétaro conspiracy is discovered and the rising for Independence is brought forward.
- 1810-11SinaloaInsurgents under González Hermosillo attack El Rosario and are beaten at San Ignacio de Piaxtla.
- 1810State of MexicoInsurgents win at Monte de las Cruces on 30 Oct.
- 1810ZacatecasNews of Hidalgo's rising reaches Zacatecas on 21 Sep.
- 1810GuanajuatoHidalgo calls the parish of Dolores to arms on 16 Sep, starting the War of Independence.
- 1810GuanajuatoInsurgents storm the Alhóndiga de Granaditas on 28 Sep.
- 1811AguascalientesAt the Hacienda de San Blas in Pabellón, Hidalgo is stripped of military command after Puente de Calderón.
- 1811ChihuahuaMiguel Hidalgo is executed in Chihuahua City on 30 Jul.
- 1811CoahuilaAt Agua Nueva on 7 Jan, Coahuila's royalist troops go over to the insurgents.
- 1811CoahuilaHidalgo, Allende and other leaders are captured at Acatita de Baján and taken to Monclova.
- 1811JaliscoRoyalists defeat the insurgents at Puente de Calderón on 17 Jan.
- 1811PueblaJosé Francisco Osorno leads the insurgency in the Sierra Norte.
- 1812HidalgoOn 16 Sep the insurgents at Huichapan hold the first commemoration of the Grito de Dolores.
- 1812MorelosMorelos holds Cuautla against Calleja from 19 Feb to 2 May.
- 1812OaxacaMorelos takes the city of Oaxaca on 25 Nov 1812.
- 1813GuerreroMorelos installs the Congress of Anáhuac in Chilpancingo.
- 1814MichoacánThe insurgent congress swears the Constitution of Apatzingán on 22 Oct.
- 1817TamaulipasFrancisco Xavier Mina lands at Soto la Marina on 15 Apr to fight for independence.
- 1821ChiapasComitán declares independence from Spain under friar Matías de Córdova.
- 1821GuerreroIturbide and Guerrero sign the Plan de Iguala on 24 Feb 1821.
- 1821Mexico CityThe Army of the Three Guarantees enters the city on 27 Sep.
- 1821San Luis PotosíThe city surrenders to the Army of the Three Guarantees and proclaims independence.
- 1821TabascoIndependence is proclaimed in Villahermosa on 7 Sep.
- 1823GuanajuatoGuanajuato is erected as a state on 20 Dec.
- 1823JaliscoJalisco declares itself a free state.
- 1823MichoacánMichoacán is erected as a state of the federation on 22 Dec.
- 1823OaxacaThe state of Oaxaca is created on 21 Dec 1823.
- 1823PueblaPuebla becomes a free state on 23 Dec.
- 1823QuerétaroQuerétaro becomes a state of the federation on 23 Dec.
- 1823San Luis PotosíSan Luis Potosí is admitted as a state on 22 Dec.
- 1823VeracruzVeracruz is admitted as a state on 22 Dec.
- 1823YucatánYucatán joins the Mexican federation on 23 Dec as a founding state.
- 1823ZacatecasZacatecas is declared a free and federated state on 18 Oct.
- 1824ChiapasChiapas joins Mexico by popular vote on 14 Sep 1824.
- 1824ChihuahuaChihuahua becomes a state of the federation on 6 Jul.
- 1824CoahuilaCoahuila y Tejas becomes a state of the new federal republic.
- 1824ColimaColima becomes a federal territory under the first constitution.
- 1824DurangoDurango becomes a state, separate from Chihuahua; its congress meets on 8 Sep.
- 1824HidalgoA British company takes over Real del Monte with steam engines and Cornish miners.
- 1824Mexico CityCongress creates the Federal District on 18 Nov.
- 1824Nuevo LeónNuevo León becomes a state of the Mexican federation on 7 May.
- 1824State of MexicoThe State of Mexico is declared free and sovereign on 1 Feb.
- 1824TabascoTabasco becomes one of the first states of the federation.
- 1824TamaulipasTamaulipas becomes a state of the federation on 7 Feb.
- 1824TlaxcalaTlaxcala becomes a federal territory on 24 Nov.
- 1825VeracruzThe last Spanish garrison surrenders San Juan de Ulúa in Nov.
- 1826ZacatecasThe state abolishes slavery and opens its first teachers' college.
- 1828AguascalientesThe first San Marcos Fair is held, 5-20 Nov, to show the region's produce and livestock.
- 1828MichoacánThe capital is renamed Morelia in honour of José María Morelos, who was born there.
- 1829TamaulipasSpain's attempt to retake Mexico is defeated at Tampico in Sep.
- 1830Baja California SurAfter rains ruin Loreto, La Paz becomes the capital.
- 1830SinaloaSinaloa separates from Sonora and becomes a state, with Culiacán as capital.
- 1830State of MexicoToluca becomes the permanent state capital.
- 1831PueblaThe first mechanized textile mill opens.
- 1831SonoraSonora separates from Sinaloa and becomes a state with Hermosillo as capital.
- 1832DurangoApache raids begin in the north-east, followed by Comanche raids into the 1850s.
- 1835AguascalientesA decree of 23 May 1835 separates Aguascalientes from Zacatecas as a territory.
- 1836CoahuilaTexas declares independence; the Treaties of Velasco follow on 14 May.
- 1837NayaritThe Department of Tepic is created on 13 Mar, with 62,620 inhabitants.
- 1838VeracruzFrench ships bombard the port in the Pastry War.
- 1841-48YucatánThe second Republic of Yucatán: Act of Independence on 1 Oct 1841; reunion with Mexico decreed on 17 Aug 1848.
- 1842ChiapasThe Soconusco is joined to Mexico after Santa Anna's troops occupy it.
- 1846Nuevo LeónBattle of Monterrey, 21-24 Sep; the city falls to Zachary Taylor's army.
- 1846-47San Luis PotosíThe state's part in the war with the USA earns it the name San Luis de la Patria.
- 1846-47TabascoUSA naval forces take Frontera and later occupy Villahermosa for 35 days.
- 1847Baja California SurMilitia under Manuel Pineda repel a USA landing at Mulegé on 2 Oct.
- 1847ChihuahuaBattle of the Sacramento River, 28 Feb; USA troops occupy the capital.
- 1847CoahuilaThe battle of La Angostura, or Buena Vista, is fought near Saltillo on 22-23 Feb.
- 1847Mexico CityInvading troops in the war with the USA storm Chapultepec Castle on 13 Sep.
- 1847VeracruzUSA forces take the port of Veracruz after a 20-day siege.
- 1847YucatánThe Caste War breaks out in the east of the state.
- 1848Baja CaliforniaThe Treaty of Guadalupe Hidalgo fixes the new border on 2 Feb.
- 1848QuerétaroThe Treaty of Guadalupe Hidalgo, ending the war with the USA, is ratified in Querétaro.
- 1848TamaulipasThe Treaty of Guadalupe Hidalgo leaves the state without more than a quarter of its territory.
- 1849GuerreroThe state of Guerrero is created on 27 Oct 1849.
- 1849State of MexicoThe state of Guerrero is created from its southern lands on 27 Oct.
- 1850Quintana RooThe Talking Cross appears and Chan Santa Cruz becomes the rebel centre.
- 1853Baja CaliforniaWilliam Walker raises a filibuster flag at Ensenada on 29 Nov and is driven out by local ranchers.
- 1853Baja California SurWilliam Walker seizes La Paz with about 45 men and is driven out.
- 1853SonoraThe Gadsden Purchase, signed 30 Dec, takes most of today's southern Arizona.
- 1854GuerreroThe Plan de Ayutla is proclaimed on 1 Mar 1854.
- 1854SonoraRaousset-Boulbon's filibusters attack Guaymas on 13 Jul and are defeated.
- 1856CoahuilaSantiago Vidaurri annexes Coahuila to Nuevo León on 19 Feb.
- 1856ColimaColima is admitted as a state on 9 Dec.
- 1856-64Nuevo LeónVidaurri joins Coahuila to Nuevo León until Juárez separates them.
- 1856TlaxcalaThe Constituent Congress approves statehood on 9 Dec.
- 1857AguascalientesThe Constitution of 1857, in force from 16 Sep, confirms Aguascalientes as a state.
- 1858ColimaColima briefly serves as the seat of Juárez's Liberal government.
- 1858GuanajuatoBenito Juárez sets up his government in Guanajuato on 16 Jan.
- 1859NayaritLozada attacks Tepic on 2 Nov; Miramón decrees the Territory of Tepic on 24 Dec.
- 1861-65TamaulipasConfederate cotton flows out through Matamoros and the port of Bagdad; the town reaches about 30,000 people.
- 1862PueblaMexican troops defeat the French army at Puebla on 5 May.
- 1863CampecheCampeche becomes a state by decree of 29 Apr.
- 1863PueblaThe French take Puebla on 17 May.
- 1863San Luis PotosíBenito Juárez makes the city the seat of the republican government during the French Intervention.
- 1863TabascoTabasco liberals defeat the imperial forces at El Jahuactal on 1 Nov.
- 1864-66ChihuahuaBenito Juárez governs the Republic from Chihuahua during the French Intervention.
- 1864SinaloaAntonio Rosales defeats a French force at San Pedro on 22 Dec.
- 1865OaxacaFrench troops take the city of Oaxaca on 9 Feb 1865, when Porfirio Díaz surrenders it.
- 1866TamaulipasRepublicans under Mariano Escobedo defeat imperial forces at Santa Gertrudis, near Camargo, on 16 Jun.
- 1867Mexico CityJuárez enters the capital on 15 Jul, ending the French Intervention.
- 1867QuerétaroMaximilian is shot on the Cerro de las Campanas on 19 Jun.
- 1867TlaxcalaRepublican forces defeat imperial troops near Calpulalpan on 10 Apr.
- 1869HidalgoOn 16 Jan Congress decrees the creation of the State of Hidalgo, with Pachuca as capital.
- 1869MorelosThe state of Morelos is created on 17 Apr.
- 1869State of MexicoHidalgo (15 Jan) and Morelos (17 Apr) are created from its territory.
- 1869TlaxcalaThe Mexico City-Apizaco-Puebla railway opens on 16 Sep.
- 1872YucatánProgreso is founded as a port closer to Mérida than Sisal.
- 1873CoahuilaFrancisco I. Madero is born in Parras.
- 1873NayaritManuel Lozada is captured and executed on 19 Jul.
- 1873PueblaThe Puebla-Veracruz railway is completed.
- 1873VeracruzThe first train from Mexico City reaches the port on 1 Jan.
The eight states with the most dated events in this era
Coahuila
1811: At Agua Nueva on 7 Jan, Coahuila's royalist troops go over to the insurgents.
6Puebla
1811: José Francisco Osorno leads the insurgency in the Sierra Norte.
6Tamaulipas
1817: Francisco Xavier Mina lands at Soto la Marina on 15 Apr to fight for independence.
5State of Mexico
1810: Insurgents win at Monte de las Cruces on 30 Oct.
5Veracruz
1823: Veracruz is admitted as a state on 22 Dec.
4Aguascalientes
1811: At the Hacienda de San Blas in Pabellón, Hidalgo is stripped of military command after Puente de Calderón.
4Chihuahua
1811: Miguel Hidalgo is executed in Chihuahua City on 30 Jul.
4Guanajuato
1810: Hidalgo calls the parish of Dolores to arms on 16 Sep, starting the War of Independence.
Where the sources disagree
- The toll of the War of Independence: 250,000 to 600,000 dead, by the range Wikipedia gives. 2
- Where Hidalgo was shot: the article's summary gives Chihuahua, while its text places his trial in Durango; our state history of Chihuahua follows the summary. 3
- The Sentiments of the Nation: 1813 is agreed, but the article's day, 31 September, does not exist. 5
- Guerrero's abolition of slavery: 15 or 16 September 1829; the article gives both. 6
- African descent among the insurgents: Morelos's baptism listed him as a Spaniard, though his father's line included Africans; Guerrero's origins are debated, and some historians suggest African heritage. 56
- How much was lost: Wikipedia says more than half; on the outlines of our territory room it is 53.6% of the Mexico of 1821 by 1848, Texas included, and about 56% counting La Mesilla. 10
- Texas's size: the chart uses the Texan claim to the Rio Grande, which the USA took up; Mexico held that Texas ended at the Nueces, and the land between the two rivers is where the war began. 910
- La Mesilla's size: 76,800 km² by the Gadsden Purchase article; 94,000 km² on our outlines, which draw the 1848 and 1853 lines differently (the territory room explains the two lines). 11
- La Mesilla: signed 30 December 1853 (a first draft on 31 December); in force 8 June or 30 June 1854, the article gives both. 11
Sources, each with its date
Wikipedia first, then the sources it cites; the state events carry their own sources on each state page.
- Wikipedia (English), Cry of Dolores · read 5 Nov 2026 · link
- Wikipedia (English), Mexican War of Independence · read 5 Nov 2026 · link
- Wikipedia (English), Miguel Hidalgo y Costilla · read 5 Nov 2026 · link
- Wikipedia (English), Leona Vicario · read 5 Nov 2026 · link
- Wikipedia (English), José María Morelos · read 5 Nov 2026 · link
- Wikipedia (English), Vicente Guerrero · read 5 Nov 2026 · link
- Wikipedia (English), First Mexican Empire · read 5 Nov 2026 · link
- Wikipedia (English), Federal Constitution of the United Mexican States of 1824 · read 5 Nov 2026 · link
- Wikipedia (English), Texas Revolution · read 5 Nov 2026 · link
- Wikipedia (English), Mexican-American War · read 5 Nov 2026 · link
- Wikipedia (English), Gadsden Purchase · read 5 Nov 2026 · link
- Wikipedia (English), Caste War of Yucatán · read 5 Nov 2026 · link
- Wikipedia (English), Reform War · read 5 Nov 2026 · link
- Wikipedia (English), Second French intervention in Mexico · read 5 Nov 2026 · link
- Wikipedia (English), Benito Juárez · read 5 Nov 2026 · link
- Wikipedia (English), Porfiriato · read 5 Nov 2026 · link
- Wikipedia (English), Porfirio Díaz · read 5 Nov 2026 · link
- Wikipedia (English), Josefa Ortiz de Domínguez · read 5 Nov 2026 · link
Picture
- Acueducto 20170917p2.jpg: Carlos Valenzuela, CC BY-SA 4.0, Wikimedia Commons