What's the "een" in Halloween?
The belief that slavery should be abolished. In the early nineteenth century, increasing numbers of people in the northern United States held that the nation's slaves should be freed immediately, without compensation to slave owners. John Brown, Frederick W. Douglass, William Lloyd Garrison, Sojourner Truth, and Harriet Tubman were well-known abolitionists.
Note: Abolitionism in the United States was an important factor leading to the Civil War.