Rosa Parks refuses to give up her seat to a white man on a bus in Montgomery, Alabama.

A 42-year-old African-American seamstress and secretary of the Montgomery branch NAACP, Parks is arrested. Four days later, more than 90% of the city’s African-American residents begin a boycott that lasts for more than year. The Supreme Court rules that the Montgomery law segregating bus seating is unconstitutional on November 13, 1956, and the policy ends on December 21, 1956. In Browder v. Gayle, the federal court subsequently ends discrimination in all interstate bus transportation.