Rosa Parks became known as the "Mother of the Civil Rights Movement" after her refusal to give up her bus seat to a white passenger in Montgomery, Alabama, on December 1, 1955. Her act of civil disobedience sparked the Montgomery Bus Boycott, which was led by Martin Luther King Jr. and became a pivotal event in the American Civil Rights Movement. Parks' courageous stand against racial segregation ignited a larger movement challenging systemic racism and inequality in the United States. Her legacy continues to inspire advocates for justice and equality around the world.