Most civil wars do not spring up overnight, and the American Civil War was no exception. The seeds of the conflict were sown in the earliest days of the republic's founding, primarily over the existence of slavery and the slave trade. Although no conflict can begin without the conscious decisions of those engaged in the debates at that moment, in the end, there was simply no way to paper over the division of the country into two camps: one that was dominated by slavery and the other that sought first to limit its spread and then to abolish it. Our nation was indeed "half slave and half free,"...