California annexation by the United States
E607216
California annexation by the United States was the mid-19th-century process, culminating in the Mexican–American War and the 1848 Treaty of Guadalupe Hidalgo, by which the U.S. took control of Mexican Alta California and incorporated it into its territory.
All labels observed (4)
| Label | Occurrences |
|---|---|
| American annexation of California | 1 |
| California annexation by the United States canonical | 1 |
| U.S. annexation of California | 1 |
| U.S. military occupation of California | 1 |
How this entity was disambiguated
This entity first appeared as the object of triple T6598900 — 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: California annexation by the United States Context triple: [Sonoma Barracks, associatedWith, California annexation by the United States]
-
A.
United States territorial expansion
United States territorial expansion refers to the historical process by which the United States grew from a cluster of Atlantic coast colonies into a transcontinental nation through purchases, wars, treaties, and settlement.
-
B.
Annexation of Hawaii by the United States in 1898
The Annexation of Hawaii by the United States in 1898 was the formal incorporation of the Hawaiian Islands into U.S. territory, ending the sovereignty of the Hawaiian Kingdom and paving the way for Hawaii’s eventual statehood.
-
C.
Annexation of Texas
The Annexation of Texas was the 1845 incorporation of the Republic of Texas into the United States, a pivotal expansionist move that heightened sectional tensions over slavery in the antebellum era.
-
D.
Alaska Purchase
The Alaska Purchase was the 1867 transaction in which the United States bought the Alaska territory from the Russian Empire, significantly expanding U.S. land holdings in North America.
-
E.
Louisiana Purchase
The Louisiana Purchase was an 1803 land deal in which the United States bought a vast territory from France, doubling the nation's size and securing control of the Mississippi River region.
- 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: California annexation by the United States Target entity description: California annexation by the United States was the mid-19th-century process, culminating in the Mexican–American War and the 1848 Treaty of Guadalupe Hidalgo, by which the U.S. took control of Mexican Alta California and incorporated it into its territory.
-
A.
United States territorial expansion
United States territorial expansion refers to the historical process by which the United States grew from a cluster of Atlantic coast colonies into a transcontinental nation through purchases, wars, treaties, and settlement.
-
B.
Annexation of Hawaii by the United States in 1898
The Annexation of Hawaii by the United States in 1898 was the formal incorporation of the Hawaiian Islands into U.S. territory, ending the sovereignty of the Hawaiian Kingdom and paving the way for Hawaii’s eventual statehood.
-
C.
Annexation of Texas
The Annexation of Texas was the 1845 incorporation of the Republic of Texas into the United States, a pivotal expansionist move that heightened sectional tensions over slavery in the antebellum era.
-
D.
Alaska Purchase
The Alaska Purchase was the 1867 transaction in which the United States bought the Alaska territory from the Russian Empire, significantly expanding U.S. land holdings in North America.
-
E.
Louisiana Purchase
The Louisiana Purchase was an 1803 land deal in which the United States bought a vast territory from France, doubling the nation's size and securing control of the Mississippi River region.
- F. None of above. chosen
Statements (49)
| Predicate | Object |
|---|---|
| instanceOf |
19th-century event
ⓘ
historical event ⓘ territorial annexation ⓘ |
| affectedPopulation |
Californios
NERFINISHED
ⓘ
Indigenous peoples of California NERFINISHED ⓘ |
| cause |
Manifest Destiny ideology
NERFINISHED
ⓘ
Mexican–American War NERFINISHED ⓘ U.S. expansionist policy ⓘ |
| concludedBy | Treaty of Guadalupe Hidalgo NERFINISHED ⓘ |
| conflict | Mexican–American War NERFINISHED ⓘ |
| countryInvolved |
Mexico
NERFINISHED
ⓘ
United States of America ⓘ
surface form:
United States
|
| dateOfTreaty | 1848-02-02 ⓘ |
| endTime | 1848 ⓘ |
| followedBy |
California Gold Rush
NERFINISHED
ⓘ
California statehood ⓘ Compromise of 1850 NERFINISHED ⓘ |
| hasEffect |
end of Mexican sovereignty over Alta California
ⓘ
incorporation of California into U.S. territory ⓘ transfer of Alta California from Mexico to the United States ⓘ |
| includesTerritory |
parts of present-day Nevada
ⓘ
parts of present-day Utah ⓘ present-day U.S. state of California ⓘ small parts of present-day Arizona ⓘ |
| legalBasis | Treaty of Guadalupe Hidalgo NERFINISHED ⓘ |
| locatedIn |
Alta California
NERFINISHED
ⓘ
Pacific Coast of North America NERFINISHED ⓘ |
| militaryCommanderInvolved |
John C. Frémont
NERFINISHED
ⓘ
John D. Sloat NERFINISHED ⓘ Robert F. Stockton NERFINISHED ⓘ Stephen W. Kearny NERFINISHED ⓘ |
| opposedBy | Mexican government NERFINISHED ⓘ |
| partOf |
Manifest Destiny era
NERFINISHED
ⓘ
westward expansion of the United States ⓘ |
| precededBy | Mexican governance of Alta California ⓘ |
| relatedTo |
Mexican Cession
NERFINISHED
ⓘ
Oregon boundary dispute NERFINISHED ⓘ Texas annexation by the United States ⓘ |
| resultedIn |
U.S. control of Pacific coastline from Oregon to Baja California border
ⓘ
granting of U.S. citizenship to many former Mexican residents of California ⓘ recognition of new U.S.–Mexico boundary ⓘ |
| significantEvent |
Bear Flag Revolt
NERFINISHED
ⓘ
Mexican–American War NERFINISHED ⓘ Treaty of Guadalupe Hidalgo NERFINISHED ⓘ U.S. military occupation of California NERFINISHED ⓘ |
| startTime | 1846 ⓘ |
| territoryTransferredFrom | Mexico NERFINISHED ⓘ |
| territoryTransferredTo | United States NERFINISHED ⓘ |
| timePeriod | mid-19th century ⓘ |
How these facts were elicited
The pipeline generated the facts above by prompting gpt-5.1 with this entity's name + description and the instruction below.
Instruction
You are a knowledge base construction expert. Given a subject entity and a description of it, return factual statements that you know for the subject as a JSON list of dictionaries(triples), where keys must be "subject", "predicate" and "object". The number of facts may be very high, between 25 to 50 or more, for very popular subjects. For less popular subjects, the number of facts can be very low, like 5 or 10. # Requirements - If you don't know the subject at all, return an empty list. - If the subject is not a named entity, return an empty list. - Include at least one triple where predicate is "instanceOf". - Do not get too wordy. - Separate several objects into multiple triples with one object.
Input
Subject: California annexation by the United States Description of subject: California annexation by the United States was the mid-19th-century process, culminating in the Mexican–American War and the 1848 Treaty of Guadalupe Hidalgo, by which the U.S. took control of Mexican Alta California and incorporated it into its territory.
Referenced by (4)
Full triples — surface form annotated when it differs from this entity's canonical label.
this entity surface form:
U.S. military occupation of California
this entity surface form:
U.S. annexation of California
this entity surface form:
American annexation of California