As a young man, John B. Prentis (1788-1848) expressed outrage over slavery, but by the end of his life he had transported thousands of enslaved persons from the upper to the lower South. Kari J. Winter's life-and-times portrayal of a slave trader illuminates the clash between two American dreams: one of wealth, the other of equality. Prentis was born into a prominent Virginia family. His grandfather, William Prentis, emigrated from London...