Rosa Parks was an African American civil rights activist who played a key role in the Montgomery Bus Boycott. The document discusses Parks' refusal in 1955 to give up her seat to a white passenger on a segregated bus in Montgomery, Alabama. As a result of her arrest, civil rights leaders organized a bus boycott that lasted over a year. The boycott challenged the legality of racial segregation and led to a Supreme Court ruling that declared Alabama's segregation laws unconstitutional. Rosa Parks' brave actions helped launch the civil rights movement and challenge racial discrimination and segregation across the United States.