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Baja California

Yuman peoples and their painted rocks, a thin chain of missions, a desert frontier settled late, then irrigated cotton, border towns and the factories of the 1960s.

Capital: Mexicali · Became a state: 1952 · Checked 3 Nov 2026

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AguascalientesBaja California SurCampecheChiapasChihuahuaCoahuilaColimaDurangoGuanajuatoGuerreroHidalgoJaliscoMexico CityMichoacánMorelosNayaritNuevo LeónOaxacaPueblaQuerétaroQuintana RooSan Luis PotosíSinaloaSonoraState of MexicoTabascoTamaulipasTlaxcalaVeracruzYucatánZacatecasBaja California
The Texas-Facing NorthThe Pacific BorderThe Bajío and Center-NorthThe CenterThe WestThe Gulf and the IsthmusThe PeninsulaThe Deep South: Guerrero, Oaxaca and Chiapas
The road from Mexicali to Tijuana through the Sierra de Juárez
The road from Mexicali to Tijuana through the Sierra de Juárez Photo: Christopher Javier Cuenca García, CC BY-SA 4.0, via Wikimedia Commons
Then and now

Baja California in figures from its history

People, 1900 census7,583Northern district only; against 3,769,020 in 2020 1
People, 2020 census3,769,020About 497 times the 1900 count 3
Became a state1952Northern Territory 1931; state 16 Jan 1952, the 29th 1
Capital founded1903Mexicali created 14 Mar 1903; capital in place of Ensenada from 1915 5
Indigenous-language speakers, 202049,130Aged 3 and over; 1.36% of that population 3
Mexico's largest cotton zoneEarly 1950sThe irrigated Mexicali Valley led the country in cotton 5
Rock art at El Vallecitoc. 1000 BCEKumeyaay painted rocks near La Rumorosa, about 3,000 years old 9
The first peoples

Yuman bands, desert springs and painted rocks

People reached the peninsula at least 11,000 years ago, moving down the Pacific coast. They never built cities here. The land rewarded mobility, and small bands moved with the seasons between the coast and the sierras, living by gathering, hunting and fishing. In the north lived peoples of the Yuman family, the Kumeyaay (Kumiai), Paipai, Kiliwa and Cucapá, the last of them on the lower Colorado River. Farther south, toward the 28th parallel, lived the Cochimí.

Indigenous languages spoken today

Speakers aged 3 and over, census of 2020 4

Mixtec21,765
Zapotec5,945

INEGI's 2020 census counted 49,130 speakers aged 3 and over (1.36% of that population). INEGI's state panorama gives only the two largest languages, as shares of that total (Mixtec 44.3%, Zapotec 12.1%); the counts above apply those shares to the total and are rounded. The native Yuman languages, Kumiai, Paipai, Kiliwa and Cucapá, are still spoken by small communities; Cochimí is no longer spoken.

The port of Ensenada
The port of Ensenada Photo: cesar bojorquez from Tijuana, Mexico, CC BY 2.0, via Wikimedia Commons

What they left is mostly on stone. Baja California has more than 70 rock art sites. At El Vallecito, near La Rumorosa, the Kumeyaay painted figures about 3,000 years ago, in an area people had used since about 8000 BCE; one figure, El Diablito, is lit by the sun around the winter solstice. These peoples are still here, though in small numbers. The Kiliwa community counted 11 people in 2019, and Cochimí is no longer spoken. In 2020 the census counted 49,130 speakers of Indigenous languages, most of them Mixtec and Zapotec, languages of southern Mexico.

Sources: 12934

The colonial centuries

The last missions of the Californias

Spanish ships mapped the coast long before anyone settled it. Francisco de Ulloa reached these shores in 1539 and 1540, Juan Rodríguez Cabrillo entered the bay of San Quintín on 22 Aug 1542 and the bay of Ensenada on 17 Sep, and Sebastián Vizcaíno named it Todos Santos on 2 Nov 1602. Settlement came from the south. The Jesuits, based at Loreto from 1697, pushed north with missions at Santa Gertrudis (1752), San Borja (1762) and Santa María (1767).

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AguascalientesBaja California SurCampecheChiapasChihuahuaCoahuilaColimaDurangoGuanajuatoGuerreroHidalgoJaliscoMexico CityMichoacánMorelosNayaritNuevo LeónOaxacaPueblaQuerétaroQuintana RooSan Luis PotosíSinaloaSonoraState of MexicoTabascoTamaulipasTlaxcalaVeracruzYucatánZacatecasBaja CaliforniaBaja California SurSonoraTijuana6Ensenada5Santo Domingo de la Frontera4San Fernando Velicatá3El Vallecito2Mexicali1
Archaeological siteCityPortMissionnumbers match the cards
Click a neighbour to open its history.Tap a neighbour to open its history.

After the Jesuits were expelled in 1768, the Franciscans founded San Fernando Velicatá on 14 May 1769, the first mission of Junípero Serra, and the same year the Portolá expedition set out overland for Alta California. From 1773 the Dominicans took over the frontier and built a chain of missions from El Rosario (1774) to El Descanso (1817), among them Santo Domingo (1775). Mission life rested on Native labour in fields, orchards and herds, with small dams and aqueducts. Epidemics cut the Indigenous population hard; by about 1818 Velicatá had no resident missionary. In 1804 the crown split the Californias at the line between Franciscan and Dominican missions.

Sources: 121011128

Places in its history

1

Mexicali

City · 1903

Born with the Colorado River canals in 1903; state capital since 1915. 5

2

El Vallecito

Archaeological site · c. 1000 BCE

Kumeyaay rock paintings in the hills of La Rumorosa. 9

3

San Fernando Velicatá

Mission · 1769

Serra's first mission, in a Cochimí village; ruins, an aqueduct and petroglyphs remain. 10

4

Santo Domingo de la Frontera

Mission · 1775

Dominican mission among the Kiliwa, moved inland in 1793; adobe walls survive. 12

5

Ensenada

Port · 1542; 1882

Bay reached by Cabrillo in 1542; seat of the northern district from 1882 to 1915. 8

6

Tijuana

City · 1889

Founded in 1889; Prohibition resort town, then a centre of the maquiladora from 1965. 6

Independence to the Revolution

A frontier the new border drew

Independence was felt here from afar; José Darío Argüello, the last colonial governor, served until 1822, and the peninsula became a federal territory, governed directly from Mexico City, in 1824. In 1829 Santiago Argüello received the Rancho Tía Juana. The missions were secularised in the 1830s, their lands passing from the friars to civil authorities. The 1848 treaty after the war with the USA drew the new border along the northern edge of what are now Tijuana, Tecate and Mexicali, and this thin strip became the northern edge of Mexico. On 29 Nov 1853 the filibuster William Walker, a USA adventurer bent on a republic of his own, raised his flag at Ensenada; Antonio Meléndrez and local ranchers drove him back to the border.

1810 to 1920 in Baja California

From the timeline below, coloured by era

  1. 1848The Treaty of Guadalupe Hidalgo fixes the new border on 2 Feb. 2
  2. 1853William Walker raises a filibuster flag at Ensenada on 29 Nov and is driven out by local ranchers. 8
  3. 1882The seat of the northern district moves from Real del Castillo to Ensenada on 15 May. 8
  4. 1889Tijuana is founded on 11 Jul on the old Rancho Tía Juana. 6
  5. 1903Mexicali is created on 14 Mar as Colorado River water opens the valley to farming. 5
  6. 1911Magonista rebels hold Mexicali and Tijuana before federal troops return. 1

The people, then and now

Census counts, from the figures above

People, 1900 census7,583
People, 2020 census3,769,020

Sources: 13

Gold found at Japa in 1873 made Real del Castillo the district seat for a few years, but on 15 May 1882 the seat moved to Ensenada. Under the Porfiriato, Porfirio Díaz's rule of 1876-1911, huge land concessions went to foreign colonisation companies, from Huller and Sisson in 1884 to the International Company of Mexico in 1887, and Tijuana was founded on 11 Jul 1889. In 1900 a canal from the Colorado River opened the Mexicali Valley; Mexicali was created in 1903, and its farms relied on thousands of Chinese labourers. In 1911 the Magonistas, anarchist followers of Ricardo Flores Magón, held Mexicali and Tijuana for some weeks, and in 1915 the capital moved to Mexicali. In 1937 the Asalto a las Tierras, when landless farmers occupied foreign-owned estates, brought the valley's land into Mexican hands.

Sources: 1268513

How its economy turned

Cotton, casinos and the assembly line

The 20th century filled the empty north. During Prohibition in the USA, Tijuana's bars and the Agua Caliente resort, opened in 1928 with a hotel, casino and racetrack, drew visitors from California until gambling was banned in 1935. The Mexicali Valley grew cotton on irrigated land, and by the early 1950s it was the country's largest cotton zone. Population rose from 78,907 in 1940 to 226,965 in 1950, and on 16 Jan 1952 the Northern Territory became the 29th state.

The region, c. 1600 and today

What each state turned on, by the era table below; Baja California outlined in gold.

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c. 1600

AguascalientesBaja California SurCampecheChiapasChihuahuaCoahuilaColimaDurangoGuanajuatoGuerreroHidalgoJaliscoMexico CityMichoacánMorelosNayaritNuevo LeónOaxacaPueblaQuerétaroQuintana RooSan Luis PotosíSinaloaSonoraState of MexicoTabascoTamaulipasTlaxcalaVeracruzYucatánZacatecasBaja California

Baja California: Frontier: missions, presidios, independent peoples

  • Frontier: missions, presidios, independent peoples

Today

AguascalientesBaja California SurCampecheChiapasChihuahuaCoahuilaColimaDurangoGuanajuatoGuerreroHidalgoJaliscoMexico CityMichoacánMorelosNayaritNuevo LeónOaxacaPueblaQuerétaroQuintana RooSan Luis PotosíSinaloaSonoraState of MexicoTabascoTamaulipasTlaxcalaVeracruzYucatánZacatecasBaja California

Baja California: Export manufacturing

  • Export manufacturing
  • Tourism
  • Mining

Its places in the modern era

Numbered as on the map above

  • 1Mexicali · 1903
    Born with the Colorado River canals in 1903; state capital since 1915. 5
  • 6Tijuana · 1889
    Founded in 1889; Prohibition resort town, then a centre of the maquiladora from 1965. 6

When synthetic fibres hurt cotton and the Bracero program, the USA guest-worker scheme for Mexican farmhands, ended in 1964, the border turned to industry. The first assembly plants appeared in the 1960s, and the Border Industrialization Program of 1965 made the maquiladora, the export assembly plant, the region's engine; by 1988 Mexicali alone had 100 such factories. Tourism grew on the coast, with a boom at Ensenada in the 1950s and 1960s and wine in the Valle de Guadalupe. Population kept climbing, to 2,487,367 in 2000. In 1989 the state elected its first governor from outside the PRI, the party that had ruled Mexico since 1929.

In 2001 Tijuana's maquiladoras peaked at roughly 820, while migrants from across Mexico kept arriving. In Dec 2015 the Cross Border Xpress opened, a terminal and footbridge linking San Diego directly with Tijuana's airport. A frontier settled late, beside a line drawn in 1848, has made that line its livelihood: Colorado River water built Mexicali, the USA market built Tijuana, and the border remains the reason the state grew from a few thousand people in 1900 to millions.

Sources: 165714

Timeline

Baja California, date by date

Before the Spanish before 1519

  1. c. 9000 BCE

    The first people reach the peninsula at least 11,000 years ago. 1

  2. c. 1000 BCE

    Kumeyaay painters decorate the rocks of El Vallecito, near La Rumorosa. 9

The colonial centuries 1519 to 1809

  1. 1539-40

    Francisco de Ulloa becomes the first European to reach the shores of the present state. 2

  2. 1542

    Juan Rodríguez Cabrillo enters San Quintín bay on 22 Aug and Ensenada bay on 17 Sep. 2

  3. 1769

    Junípero Serra founds San Fernando Velicatá on 14 May, his first mission. 10

  4. 1774-1817

    The Dominicans build their chain of missions from El Rosario to El Descanso. 1

  5. 1804

    The crown divides the Californias into Alta and Baja. 1

Independence and the Reform 1810 to 1875

  1. 1848

    The Treaty of Guadalupe Hidalgo fixes the new border on 2 Feb. 2

  2. 1853

    William Walker raises a filibuster flag at Ensenada on 29 Nov and is driven out by local ranchers. 8

The Porfiriato 1876 to 1910

  1. 1882

    The seat of the northern district moves from Real del Castillo to Ensenada on 15 May. 8

  2. 1889

    Tijuana is founded on 11 Jul on the old Rancho Tía Juana. 6

  3. 1903

    Mexicali is created on 14 Mar as Colorado River water opens the valley to farming. 5

The Revolution 1910 to 1920

  1. 1911

    Magonista rebels hold Mexicali and Tijuana before federal troops return. 1

Modern Mexico after 1920

  1. 1928

    The Agua Caliente resort opens in Tijuana in the Prohibition years. 6

  2. 1937

    The Asalto a las Tierras returns the Mexicali Valley's farmland to Mexican farmers. 13

  3. 1952

    The Northern Territory becomes the state of Baja California on 16 Jan. 1

  4. 1965

    The Border Industrialization Program opens the era of the maquiladora. 6

  5. 2000

    The census counts 2,487,367 people, against 226,965 in 1950. 1

  6. 2001

    Tijuana's maquiladoras reach their peak, roughly 820 plants. 6

  7. 2015

    The Cross Border Xpress opens on 9 Dec, linking San Diego with Tijuana's airport. 14

The country in three moments

Where Baja California stood: c. 1600, 1910 and today

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c. 1600

Silver, the heartland and the frontier

AguascalientesBaja California SurCampecheChiapasChihuahuaCoahuilaColimaDurangoGuanajuatoGuerreroHidalgoJaliscoMexico CityMichoacánMorelosNayaritNuevo LeónOaxacaPueblaQuerétaroQuintana RooSan Luis PotosíSinaloaSonoraState of MexicoTabascoTamaulipasTlaxcalaVeracruzYucatánZacatecasBaja California

Baja California: Frontier: missions, presidios, independent peoples

  • Silver mining districts
  • Towns, farms and workshops of the old heartland
  • Ports, sugar and cacao
  • Indigenous south: cochineal, maize, tribute
  • Maya lands under encomienda or beyond Spanish rule
  • Frontier: missions, presidios, independent peoples

1910

The Porfiriato at its height

AguascalientesBaja California SurCampecheChiapasChihuahuaCoahuilaColimaDurangoGuanajuatoGuerreroHidalgoJaliscoMexico CityMichoacánMorelosNayaritNuevo LeónOaxacaPueblaQuerétaroQuintana RooSan Luis PotosíSinaloaSonoraState of MexicoTabascoTamaulipasTlaxcalaVeracruzYucatánZacatecasBaja California

Baja California: Ranching frontier

  • Mining
  • Oil
  • Henequén
  • Sugar and textile mills
  • Haciendas: grain, pulque, cattle
  • Export crops: coffee, tobacco, cacao, chicle, timber
  • Steel, cotton and the railway north
  • Ranching frontier
  • The national capital

Today

What each state turns on now

AguascalientesBaja California SurCampecheChiapasChihuahuaCoahuilaColimaDurangoGuanajuatoGuerreroHidalgoJaliscoMexico CityMichoacánMorelosNayaritNuevo LeónOaxacaPueblaQuerétaroQuintana RooSan Luis PotosíSinaloaSonoraState of MexicoTabascoTamaulipasTlaxcalaVeracruzYucatánZacatecasBaja California

Baja California: Export manufacturing

  • Export manufacturing
  • Oil and gas
  • Tourism
  • Farming and agro-exports
  • Mining
  • Ports and logistics
  • Services and government

Why Mexico's own reading of what each state's economy turned on in that period, drawn from the sources listed in each state's room; a classification, not a measurement.

Keep going
Rutanamex

Today's numbers for Baja California

Output, exports, jobs, wages and investment now, each with its source and date.

The book

Book 6, Where to Go in Mexico, chapter 14

Where to Go in Mexico: The Pacific Border, the corridor this state belongs to.

Why Mexico

The national timeline

The turning points of the whole country, each dated, each with its source.

Sources, each with its date

  1. Wikipedia (English), Baja California, History section and historical population table, 3 Nov 2026 · read 3 Nov 2026 · link
  2. Wikipedia (Spanish), Baja California, Historia section, 3 Nov 2026 · read 3 Nov 2026 · link
  3. INEGI, Censo de Población y Vivienda 2020, results for Baja California (press release 30/21), 26 Jan 2021 · read 3 Nov 2026 · link
  4. INEGI, Panorama sociodemográfico de Baja California, Censo de Población y Vivienda 2020, 2021 · read 3 Nov 2026 · link
  5. Wikipedia (English), Mexicali, 3 Nov 2026 · read 3 Nov 2026 · link
  6. Wikipedia (English), Tijuana, 3 Nov 2026 · read 3 Nov 2026 · link
  7. Wikipedia (English), Ensenada, Baja California, 3 Nov 2026 · read 3 Nov 2026 · link
  8. Wikipedia (Spanish), Ensenada (Baja California), 3 Nov 2026 · read 3 Nov 2026 · link
  9. Wikipedia (English), El Vallecito, 3 Nov 2026 · read 3 Nov 2026 · link
  10. Wikipedia (English), Misión San Fernando Rey de España de Velicatá, 3 Nov 2026 · read 3 Nov 2026 · link
  11. Wikipedia (Spanish), Misión de San Fernando Rey de España de Velicatá, 3 Nov 2026 · read 3 Nov 2026 · link
  12. Wikipedia (English), Misión Santo Domingo de la Frontera, 3 Nov 2026 · read 3 Nov 2026 · link
  13. San Diego Red, 'Mexicali marks 89 years since landmark land movement' (Asalto a las Tierras, 1937), 28 Jan 2026 · read 3 Nov 2026 · link
  14. Wikipedia (English), Cross Border Xpress, 3 Nov 2026 · read 3 Nov 2026 · link

Pictures

Where the sources disagree

  • First peoples: Wikipedia (English) gives at least 11,000 years ago; Wikipedia (Spanish) gives about 14,000. This page uses 11,000.
  • San Fernando Velicatá: Wikipedia (English) gives 14 May 1769; Wikipedia (Spanish) gives 14 Feb 1769. This page uses 14 May.
  • Ensenada: Wikipedia (English) says it was founded in 1542 as San Mateo; Wikipedia (Spanish) treats 15 May 1882, when the district seat moved there, as the founding. This page gives both events.
  • William Walker, 1853: Wikipedia (English) places his capture at La Paz; Wikipedia (Spanish, Ensenada) has him raising his flag at Ensenada on 29 Nov 1853. This page uses Ensenada.
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Aguascalientes

Chichimeca hunting grounds became a rest stop on the silver road, then a state carved from Zacatecas, a railway town and, from 1982, a car-making valley.

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Baja California Sur

Painted caves of the Cochimí, pearls and Jesuit missions, a French copper town, and a remote territory that became a state and a tourist coast in 1974.