Rosa Parks refused to give up her seat to a white passenger on a segregated bus in 1955, leading to her arrest. This sparked the Montgomery Bus Boycott, organized by Martin Luther King Jr., which protested segregation policies. Although Parks lost her job due to her activism, she continued protesting for civil rights by participating in marches and rallies despite threats to her family. Her courageous actions helped inspire the civil rights movement and were an important step toward dismantling racial segregation in the United States.