Emancipation Proclamation: An executive order issued by President Abraham Lincoln during the American Civil War that declared all enslaved people in Confederate-held territory free.
Underground Railroad: A network of secret routes and safe houses used by enslaved African Americans to escape into free states or Canada during the early-to-mid 19th century.
Frederick Douglass: An influential African American abolitionist, writer, speaker, and former slave who played a key role in advocating for emancipation.