One refusal to give up a bus seat sparked a 381-day boycott

On 1 December 1955, Rosa Parks was arrested in Montgomery, Alabama for refusing to give up her seat to a white passenger. Local Black leaders, including a young Martin Luther King Jr., organized a boycott of the city's buses that lasted 381 days and ended with a Supreme Court ruling that segregated buses were unconstitutional.

— Wikipedia contributors, Montgomery bus boycott — 1955–1956