Why was Rosa Parks' action to sit at the front of the bus so important?

Rosa Parks' action to sit at the front of the bus was important because it led to the Montgomery bus boycott, which was the trigger for the civil rights movement in the 1950s. Eventually, her action led to the ending of segregation in the United States of America.

On December 1, 1955, Rosa Parks refused to surrender her seat in front of the bus to comply with the Montgomery City Code that required segregation for all public transportation. She was arrested at the scene, and on December 5, the African-American residents organized a boycott of Montgomery's city buses that lasted for 381 days.