Emancipation Proclamation: This was an executive order issued by President Abraham Lincoln during the American Civil War, declaring all slaves in Confederate-held territory were to be set free.
Underground Railroad: A network of secret routes and safe houses established in the United States during the early-to-mid-19th century, used by African-American slaves to escape into free states and Canada with the aid of abolitionists who were sympathetic to their cause.
Frederick Douglass: An escaped slave who became a prominent activist, author, and public speaker. He became a leader in the abolitionist movement, which sought to end the practice of slavery before and during the Civil War.