What is the setting of The Guns of the South: A Novel of the Civil War by Harry Turtledove?

The Guns of the South: A Novel of the Civil War is set in different locations both during and after the war. The novel begins at Lee's Headquarters near Orange Court House in Virginia. The Lee mansion is in Arlington, a suburb of Washington, which is the capital of the North. Other locations include Nash County, North Carolina; Nashville, Tennessee; Louisville, Kentucky; and St. Louis, Missouri.