When fifteen-year-old Claudette Colvin boarded a segregated bus on March 2, 1955, she had no idea she was about to make history. At school she was learning about abolitionists like Harriet Tubman and Sojourner Truth, which helped inspire her decision to refuse to give up her seat to a white woman, which led to her arrest, which began a crucial chain of events: Rosa Park's sit-in nine months later, the organization of the Montgomery bus boycott by activists like Professor Jo Ann Robinson and Dr. Martin Luther King Jr., and the Supreme Court decision that Alabama's bus segregation was unconstitutional--a major triumph for the civil rights movement.