Then the author described the subsequent alternative history. I vaguely remember that North and South finally reunited.
There are tons of alternate history stories where the Civil War came out differently. If you're interested, look at Harry Turtledove's "American War" series. In it, the Confederacy wins, Lincoln and the Republicans are disgraced, a second war is fought in the 1880s which the South also wins with British help. The parties in the US are the Democrats and the Socialists, with the administrative capital in Philadelphia. When WWI rolls around, the Confederates side with the Brits and the Union sides with the Kaiser. The Union and Germany win. And more...