Final answer:
Rosa Parks' arrest in 1955 sparked the Montgomery Bus Boycott, a year-long boycott of the city's buses by African Americans. The boycott eventually led to the desegregation of the bus system.
Step-by-step explanation:
Rosa Parks' arrest on December 1, 1955, for refusing to give up her seat to a white man on a bus in Montgomery, Alabama, was a significant event in the civil rights movement. Her arrest inspired the Montgomery Bus Boycott, a year-long boycott of the city's buses by African Americans, which ultimately led to the desegregation of the bus system. The boycott was organized and led by various civil rights activists, including Jo Ann Robinson, E.D. Nixon, and Martin Luther King Jr.