Mexican Alta California

E17150

former Mexican territory former province historical region

Mexican Alta California was a vast northwestern province of Mexico from 1821 to 1848, encompassing much of present-day California and parts of neighboring U.S. states before its cession to the United States.

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AI illustration

All labels observed (20)

Label	Occurrences
Alta California	33
Mexican California	18
Californio	8
Mexican Alta California canonical	6
Mexican era of California	6
Las Californias	4
Mexican government of Alta California	3
Mexican territory of Alta California	3
Mexico (historical Alta California)	2
Alta California (Mexican territory)	1
Alta California Territory	1
Alta California settlements	1
Department of Alta California	1
Mexican Cession (unorganized U.S. territory)	1
Mexican Territory of Alta California	1
Mexican authorities in Alta California	1
Mexican authorities in California (before U.S. annexation)	1
Mexican civil administration of Alta California	1
Mexico (historical, Alta California period)	1
Spanish California	1

How this entity was disambiguated

This entity first appeared as the object of triple T71804 — resolving that mention is where its identity was fixed. The disambiguator weighed these candidate entities and picked the highlighted one (or “None”, minting a new entity). This is how homonymy is resolved: the same surface form can point to different entities.

NED1 Entity disambiguation (via context triple) gpt-5-mini-2025-08-07

Target entity: Mexican Alta California
Context triple: [Legislature of California under Mexican rule, historicalRegion, Mexican Alta California]

A. Baja California
Baja California is a long, narrow peninsula in northwestern Mexico known for its deserts, rugged coastline, and popular tourist destinations such as Tijuana and Ensenada.
B. Viceroyalty of New Spain
The Viceroyalty of New Spain was a major administrative division of the Spanish Empire in the Americas, encompassing much of present-day Mexico, Central America, the Caribbean, and parts of the present-day United States from the 16th to the early 19th century.
C. Cascadia
Cascadia is a bioregion and cultural concept in the Pacific Northwest that encompasses parts of the U.S. and Canadian west coast, known for its temperate rainforests, mountain ranges, and strong environmental identity.
D. Tlalpan
Tlalpan is one of the largest and southernmost boroughs of Mexico City, known for its extensive green areas, historic center, and mix of urban and rural zones.
E. Republic of Texas
The Republic of Texas was an independent sovereign nation in North America from 1836 to 1845, formed after winning independence from Mexico before later joining the United States.
F. None of above. chosen
G. Unsure - the case is ambiguous/there is not enough information to decide.

NED2 Entity disambiguation (via description) gpt-5-mini-2025-08-07

Target entity: Mexican Alta California
Target entity description: Mexican Alta California was a vast northwestern province of Mexico from 1821 to 1848, encompassing much of present-day California and parts of neighboring U.S. states before its cession to the United States.

A. Baja California
Baja California is a long, narrow peninsula in northwestern Mexico known for its deserts, rugged coastline, and popular tourist destinations such as Tijuana and Ensenada.
B. Viceroyalty of New Spain
The Viceroyalty of New Spain was a major administrative division of the Spanish Empire in the Americas, encompassing much of present-day Mexico, Central America, the Caribbean, and parts of the present-day United States from the 16th to the early 19th century.
C. Cascadia
Cascadia is a bioregion and cultural concept in the Pacific Northwest that encompasses parts of the U.S. and Canadian west coast, known for its temperate rainforests, mountain ranges, and strong environmental identity.
D. Tlalpan
Tlalpan is one of the largest and southernmost boroughs of Mexico City, known for its extensive green areas, historic center, and mix of urban and rural zones.
E. Republic of Texas
The Republic of Texas was an independent sovereign nation in North America from 1836 to 1845, formed after winning independence from Mexico before later joining the United States.
F. None of above. chosen

Statements (48)

Predicate	Object
instanceOf	former Mexican territory ⓘ former province ⓘ historical region ⓘ
administrativeDivisionOf	Mexican North ⓘ
borderChange	lost to the United States after the Mexican–American War ⓘ
capital	Monterey ⓘ
continent	North America ⓘ
country	First Mexican Empire ⓘ United Mexican States ⓘ linked to: Mexico
currency	Mexican peso ⓘ
demographics	Californios (Spanish-speaking Mexican residents) ⓘ linked to: Californios Indigenous peoples of California ⓘ small number of foreign settlers (mainly American and European) ⓘ
economy	cattle ranching ⓘ hide and tallow trade ⓘ small-scale agriculture ⓘ
endTime	1848 ⓘ
followedBy	California (U.S. state) ⓘ linked to: California, United States U.S. Territory of Oregon (for northern portions) ⓘ linked to: Oregon Country
governmentType	Mexican territorial administration ⓘ
hadMissionSystemLegacy	Spanish missions in California (continued influence under Mexico) ⓘ linked to: Spanish missions in California
landPolicy	Mexican land grant (ranchos) system ⓘ
languageUsed	Spanish ⓘ various Indigenous languages ⓘ
legalSystem	Mexican law ⓘ
locatedInPresentDay	Arizona ⓘ Baja California Peninsula (northern part, historically associated) ⓘ linked to: Baja California California ⓘ linked to: California, United States Nevada ⓘ Oregon ⓘ Utah ⓘ Wyoming ⓘ
locatedInTimeZone	Pacific Time Zone ⓘ
militaryConflict	Californian campaign of the Mexican–American War ⓘ
notableCity	Los Angeles ⓘ San Diego ⓘ San Francisco ⓘ San José ⓘ linked to: San Jose Santa Barbara ⓘ
partOf	Mexico ⓘ
precededBy	Alta California (Spanish colony) ⓘ
reasonForEnd	cession to the United States under the Treaty of Guadalupe Hidalgo ⓘ
religion	Roman Catholicism ⓘ
significantEvent	Bear Flag Revolt ⓘ Mexican War of Independence ⓘ Mexican–American War ⓘ
startTime	1821 ⓘ
treaty	Treaty of Guadalupe Hidalgo ⓘ

How these facts were elicited