King becomes spokesman of the Montgomery Bus Boycott the night after Parks’s arrest is organized as a mass stay-off
On 5 December 1955 Montgomery’s Black riders stayed off the buses and the Montgomery Improvement Association elected King its president. The boycott ran to 20 December 1956, when Browder v. Gayle ended bus segregation in the city. In the causal graph this event strengthens Protection of Minority Rights, a driver that strengthens Having a say in government — an improving welfare path.
Read the full account
On 5 December 1955 Montgomery’s Black riders stayed off the buses and the Montgomery Improvement Association elected King its president. The boycott ran to 20 December 1956, when Browder v. Gayle ended bus segregation in the city.
Context
He did not board as Parks. He did become the public spokesman and a bomb-target. The legal instrument is the court; the mass instrument is the stay-off.
Martin Luther King Jr.’s documented role is bounded by other offices and collaborators named in the sources below.
Rosa Parks, Jo Ann Robinson, E. D. Nixon, and the Women’s Political Council organized the first day. King was elected MIA president on 5 December. Shared.
Why it matters
A boycott is not SCLC. Keep January 1957 separate.
Who was responsible
Contribution type and responsibility level for each recorded actor — not sole-author shorthand.
Martin Luther King Jr.
PersonDirect responsibility
responsibility level 0.6 · verified
What changed
Fact → Driver → Indicator. Relationship strength orders the paths; it is not the observed indicator movement.
- FactKing becomes spokesman of the Montgomery Bus Boycott the night after Parks’s arrest is organized as a mass stay-off
- strengthensDriverProtection of Minority Rights
- strengthensIndicators (2)Having a say in government
impact weight 0.5 · Effect from 5 December 1955 · verified
Strengthens · Relationship strength 0.23 (weight 0.5 × strength 0.45)
Observed
29.8% of population aged 16-65 years · 8.13 below the normal line (2023)
Worse than normalTwo readings: 30.2% of population aged 16-65 years (2021) and 29.8% of population aged 16-65 years (2023).
20212023 Above normal = better
Weakens · Relationship strength 0.23 (weight 0.5 × strength 0.45)
Observed
43.9 Score · 43.9 above the normal line (2024)
Worse than normal26 readings, 1996–2024: rose from 43 Score to 43.9 Score.
Normal is zero · any amount = worse
Evidence
The sources behind this fact and its verification state.
- 1.Britannica — Montgomery bus boycottEncyclopaedia Britannica · High credibility · verified
- 2.King Institute — Montgomery Bus BoycottStanford University · High credibility · verified
What the sources establish
King Institute Montgomery encyclopedia and Britannica’s boycott entry independently date 5 December 1955 and the 1956 court end.
Established: the boycott began 5 December 1955 with King as MIA president and ended after Browder v. Gayle. Not established: that he planned Parks’s arrest.
Causal path
How this event connects to drivers and indicators in the graph.
- ActorMartin Luther King Jr.
- contributed toFactKing becomes spokesman of the Montgomery Bus Boycott the night after Parks’s arrest is organized as a mass stay-off
- strengthensDriverProtection of Minority Rights
- strengthensIndicatorHaving a say in government
Cite this page
Factrail. (2026). King becomes spokesman of the Montgomery Bus Boycott the night after Parks’s arrest is organized as a mass stay-off. Factrail. https://factrail.ai/facts/mlk-montgomery-bus-boycott
https://factrail.ai/facts/mlk-montgomery-bus-boycott
Accessed 16 October 2026.
By the Factrail desk · Method: how we source and score · Last reviewed
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