Nearly 50 years ago, Rosa Parks made a simple decision that sparked a revolution. When a white man demanded she give up her seat on a Montgomery, Ala., bus, the then 42-year-old seamstress said no. At the time, she couldn't have known it would secure her a revered place in American history. But her one small act of defiance galvanized a generation of activists, including a young Rev. Martin Luther King Jr., and earned her the title "mother of the civil rights movement."

Advance her vision of peace, justice and equality by supporting the organizations below or finding volunteer opportunities in your community.