In 1752 an enslaved Pennsylvania ironworker named Ned purchased his freedom and moved to Virginia on the upper James River. Taking the name Edward Tarr, he became the first free black landowner west of the Blue Ridge. Tarr established a blacksmith shop on the Great Wagon Road from Philadelphia to the Carolinas and helped found a Presbyterian congregation that exists to this day. Living with him was his white, Scottish wife, and in a twist that will surprise the modern reader, Tarr's neighbors accepted his interracial marriage. It was when a second white woman joined the household that some...