In On the Edge of Freedom, David G. Smith breaks new ground by illuminating the unique development of antislavery sentiment in south central Pennsylvania--a border region of a border state with a complicated history of slavery, antislavery activism, and unequal freedom. During the antebellum decades every single fugitive slave escaping by land east of the Appalachian Mountains had to pass through the region, where they faced both significant opportunities and substantial risks. While the hundreds of fugitives traveling through south central Pennsylvania (defined as Adams, Franklin, and...