First published in 1829, Walker's Appeal called on slaves to rise up and free themselves. The two subsequent versions of his document (including the reprinted 1830 edition published shortly before Walker's death) were increasingly radical. Addressed to the whole world but directed primarily to people of color around the world, the 87-page pamphlet by a free black man born in North Carolina and living in Boston advocates immediate emancipation and slave rebellion. Walker asks the slaves among his readers whether they wouldn't prefer to "be killed than to be a slave to a tyrant." He...