A Kingdom Divided uncovers how evangelical Christians in the border states influenced debates about slavery, morality, and politics from the 1830s to the 1890s. Using little-studied events and surprising incidents from the region, April E. Holm argues that evangelicals on the border powerfully shaped the regional structure of American religion in the Civil War era.

In the decades before the Civil War, the three largest evangelical denominations diverged sharply over the sinfulness of slavery. This division generated tremendous local conflict in the border region, where...