Major League Baseball color barrier
E652263
The Major League Baseball color barrier was the unwritten but rigid segregation policy that kept Black players out of the major leagues until Jackie Robinson broke it in 1947.
All labels observed (1)
| Label | Occurrences |
|---|---|
| Major League Baseball color barrier canonical | 1 |
How this entity was disambiguated
This entity first appeared as the object of triple T7242051 — 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: Major League Baseball color barrier Context triple: [I Never Had It Made, mainSubject, Major League Baseball color barrier]
-
A.
Negro Leagues
The Negro Leagues were a collection of professional African American baseball leagues in the United States that operated during the era of racial segregation and showcased many of the sport’s greatest talents before integration into Major League Baseball.
-
B.
Major League Baseball All-Century Team
The Major League Baseball All-Century Team is a roster of the sport’s greatest players of the 20th century, selected through fan voting and a panel of experts and unveiled in 1999.
-
C.
Major League Baseball labor disputes
Major League Baseball labor disputes are recurring conflicts between team owners and players over issues like salaries, free agency, and working conditions that have led to strikes, lockouts, and significant disruptions to the sport.
-
D.
Jackie Robinson Day
Jackie Robinson Day is an annual Major League Baseball celebration on April 15 honoring Jackie Robinson’s breaking of the sport’s color barrier, during which all players wear his retired number 42.
-
E.
The Jackie Robinson Story
The Jackie Robinson Story is a 1950 biographical film in which baseball legend Jackie Robinson portrays himself, dramatizing his historic breaking of Major League Baseball’s color barrier.
- 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: Major League Baseball color barrier Target entity description: The Major League Baseball color barrier was the unwritten but rigid segregation policy that kept Black players out of the major leagues until Jackie Robinson broke it in 1947.
-
A.
Negro Leagues
The Negro Leagues were a collection of professional African American baseball leagues in the United States that operated during the era of racial segregation and showcased many of the sport’s greatest talents before integration into Major League Baseball.
-
B.
Major League Baseball All-Century Team
The Major League Baseball All-Century Team is a roster of the sport’s greatest players of the 20th century, selected through fan voting and a panel of experts and unveiled in 1999.
-
C.
Major League Baseball labor disputes
Major League Baseball labor disputes are recurring conflicts between team owners and players over issues like salaries, free agency, and working conditions that have led to strikes, lockouts, and significant disruptions to the sport.
-
D.
Jackie Robinson Day
Jackie Robinson Day is an annual Major League Baseball celebration on April 15 honoring Jackie Robinson’s breaking of the sport’s color barrier, during which all players wear his retired number 42.
-
E.
The Jackie Robinson Story
The Jackie Robinson Story is a 1950 biographical film in which baseball legend Jackie Robinson portrays himself, dramatizing his historic breaking of Major League Baseball’s color barrier.
- F. None of above. chosen
Statements (49)
| Predicate | Object |
|---|---|
| instanceOf |
discriminatory practice
ⓘ
historical phenomenon ⓘ racial segregation policy ⓘ |
| alsoKnownAs |
baseball color line
ⓘ
color line in Major League Baseball ⓘ |
| appliesTo | Major League Baseball NERFINISHED ⓘ |
| basedOn |
race
ⓘ
white supremacy ⓘ |
| brokenBy | Jackie Robinson NERFINISHED ⓘ |
| brokenInContextOf | Brooklyn Dodgers NERFINISHED ⓘ |
| brokenInLeague | National League NERFINISHED ⓘ |
| brokenOn | 1947-04-15 ⓘ |
| causedCreationOf |
Negro leagues
NERFINISHED
ⓘ
separate Black professional baseball leagues ⓘ |
| challengedBy |
Branch Rickey
NERFINISHED
ⓘ
civil rights advocates ⓘ |
| criticizedBy |
Black press
ⓘ
civil rights organizations ⓘ some white sportswriters ⓘ |
| documentedIn |
civil rights histories
ⓘ
sports journalism ⓘ |
| emergedAfter | Reconstruction era ⓘ |
| endedWith | gradual integration of all MLB teams after 1947 ⓘ |
| enforcedBy |
Major League Baseball executives
NERFINISHED
ⓘ
Major League team owners ⓘ informal agreement among club owners ⓘ |
| excludes |
African American players
ⓘ
Black players ⓘ |
| fullyDismantledBy | 1950s ⓘ |
| hadException | Moses Fleetwood Walker in 19th century professional baseball NERFINISHED ⓘ |
| hasCharacteristic |
informal but rigid policy
ⓘ
racially exclusionary ⓘ unwritten rule ⓘ |
| influenced |
broader civil rights discourse
ⓘ
integration of other professional sports leagues ⓘ |
| legacy | ongoing discussions of race and equality in baseball ⓘ |
| legalStatus |
enforced through custom and hiring practices
ⓘ
not codified in formal MLB rules ⓘ |
| maintainedUntil | 1947 ⓘ |
| opposedBy | some players and managers ⓘ |
| precededBy | earlier integrated professional baseball in the 19th century ⓘ |
| relatedTo |
Jim Crow laws
NERFINISHED
ⓘ
Negro leagues NERFINISHED ⓘ racial segregation in the United States ⓘ |
| resultedIn |
economic marginalization of Black baseball players
ⓘ
exclusion of Black players from Major League rosters ⓘ segregated fan experiences in some ballparks ⓘ |
| startPeriod | late 19th century ⓘ |
| symbolizedBy | exclusion of Black players from Major League fields ⓘ |
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: Major League Baseball color barrier Description of subject: The Major League Baseball color barrier was the unwritten but rigid segregation policy that kept Black players out of the major leagues until Jackie Robinson broke it in 1947.
Referenced by (1)
Full triples — surface form annotated when it differs from this entity's canonical label.