Before we pass through the door that Lorenzo Ivy opened, here are the chapters’ names. The first is “Feet,” for the story begins with unfree movement on paths to enslaved frontiers that were laid down between the end of the American Revolution in 1783 and the early 1800s. “Heads” is the title of the second chapter, which covers America’s acquisition of the key points of the Mississippi Valley by violence, a gain that also consolidated the enslavers’ hold on the frontier. Then come the “Right Hand” and the “Left Hand” (Chapters 3 and 4). They reveal the inner secrets of enslavers’ power,
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