Missouri–Iowa border
E503481
The Missouri–Iowa border is the state line in the Midwestern United States separating Missouri and Iowa, running largely east–west near the 40th parallel north.
All labels observed (2)
| Label | Occurrences |
|---|---|
| Iowa–Missouri state line | 1 |
| Missouri–Iowa border canonical | 1 |
How this entity was disambiguated
This entity first appeared as the object of triple T5211092 — 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: Missouri–Iowa border Context triple: [Nebraska–Iowa border, adjacentTo, Missouri–Iowa border]
-
A.
Nebraska–Missouri border
The Nebraska–Missouri border is the state line in the central United States that largely follows the course of the Missouri River, separating Nebraska to the west from Missouri to the east.
-
B.
Nebraska–Iowa border
The Nebraska–Iowa border is the state line in the central United States that largely follows the course of the Missouri River, separating Nebraska to the west from Iowa to the east.
-
C.
Missouri–Kansas state line
The Missouri–Kansas state line is the boundary separating the states of Missouri and Kansas, notably running through the Kansas City metropolitan area and dividing it between the two states.
-
D.
Iowa–Illinois state line
The Iowa–Illinois state line is the boundary separating the U.S. states of Iowa and Illinois, running largely along the Mississippi River and defining part of the border between the Midwest states.
-
E.
Iowa–Minnesota border
The Iowa–Minnesota border is the state line separating Iowa and Minnesota in the Midwestern United States, largely following straight survey lines with some sections defined by rivers.
- 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: Missouri–Iowa border Target entity description: The Missouri–Iowa border is the state line in the Midwestern United States separating Missouri and Iowa, running largely east–west near the 40th parallel north.
-
A.
Nebraska–Missouri border
The Nebraska–Missouri border is the state line in the central United States that largely follows the course of the Missouri River, separating Nebraska to the west from Missouri to the east.
-
B.
Nebraska–Iowa border
The Nebraska–Iowa border is the state line in the central United States that largely follows the course of the Missouri River, separating Nebraska to the west from Iowa to the east.
-
C.
Missouri–Kansas state line
The Missouri–Kansas state line is the boundary separating the states of Missouri and Kansas, notably running through the Kansas City metropolitan area and dividing it between the two states.
-
D.
Iowa–Illinois state line
The Iowa–Illinois state line is the boundary separating the U.S. states of Iowa and Illinois, running largely along the Mississippi River and defining part of the border between the Midwest states.
-
E.
Iowa–Minnesota border
The Iowa–Minnesota border is the state line separating Iowa and Minnesota in the Midwestern United States, largely following straight survey lines with some sections defined by rivers.
- F. None of above. chosen
Statements (57)
| Predicate | Object |
|---|---|
| instanceOf |
internationally recognized internal boundary
ⓘ
state border ⓘ |
| country |
United States of America
ⓘ
surface form:
United States
|
| courtDecisionYear | 1849 ⓘ |
| definedBy |
United States Supreme Court decree
ⓘ
federal surveys ⓘ |
| direction | east–west ⓘ |
| disputePeriod | 1830s ⓘ |
| disputeType | tax and jurisdiction dispute ⓘ |
| disputeWith |
State of Iowa
NERFINISHED
ⓘ
State of Missouri NERFINISHED ⓘ |
| easternTerminus | Mississippi River NERFINISHED ⓘ |
| followsParallel | 40th parallel north ⓘ |
| hasBorderDisputesHistory | Honey War NERFINISHED ⓘ |
| hasCourtCase | State of Missouri v. State of Iowa NERFINISHED ⓘ |
| hasSurvey | Sullivan Line NERFINISHED ⓘ |
| historicalBasis |
Missouri Enabling Act
NERFINISHED
ⓘ
Treaty of Fort Clark NERFINISHED ⓘ |
| legalStatus | state line ⓘ |
| locatedInRegion |
American Midwest
NERFINISHED
ⓘ
Midwestern United States ⓘ |
| partOf |
borders of Iowa
ⓘ
borders of Missouri ⓘ |
| passesNear |
Council Bluffs, Iowa
NERFINISHED
ⓘ
Keokuk, Iowa NERFINISHED ⓘ Maryville, Missouri NERFINISHED ⓘ St. Joseph, Missouri NERFINISHED ⓘ |
| passesThrough |
Appanoose County, Iowa
NERFINISHED
ⓘ
Atchison County, Missouri NERFINISHED ⓘ Clark County, Missouri NERFINISHED ⓘ Davis County, Iowa NERFINISHED ⓘ Decatur County, Iowa NERFINISHED ⓘ Fremont County, Iowa NERFINISHED ⓘ Harrison County, Missouri NERFINISHED ⓘ Holt County, Missouri NERFINISHED ⓘ Mercer County, Missouri NERFINISHED ⓘ Nodaway County, Missouri NERFINISHED ⓘ Page County, Iowa NERFINISHED ⓘ Putnam County, Missouri NERFINISHED ⓘ Ringgold County, Iowa NERFINISHED ⓘ Schuyler County, Missouri NERFINISHED ⓘ Scotland County, Missouri NERFINISHED ⓘ Taylor County, Iowa NERFINISHED ⓘ Van Buren County, Iowa NERFINISHED ⓘ Wayne County, Iowa NERFINISHED ⓘ Worth County, Missouri NERFINISHED ⓘ |
| resolvedBy | United States Supreme Court NERFINISHED ⓘ |
| separates |
Iowa
NERFINISHED
ⓘ
Missouri NERFINISHED ⓘ |
| surveyedBy | John C. Sullivan NERFINISHED ⓘ |
| surveyYear | 1816 ⓘ |
| touchesRiver |
Mississippi River
NERFINISHED
ⓘ
Missouri River NERFINISHED ⓘ |
| usedFor |
electoral boundary
ⓘ
jurisdictional boundary ⓘ taxation boundary ⓘ |
| westernTerminus | Missouri River NERFINISHED ⓘ |
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: Missouri–Iowa border Description of subject: The Missouri–Iowa border is the state line in the Midwestern United States separating Missouri and Iowa, running largely east–west near the 40th parallel north.
Referenced by (2)
Full triples — surface form annotated when it differs from this entity's canonical label.
this entity surface form:
Iowa–Missouri state line