The Road to Disunion: Secessionists at Bay, 1776-1854: Volume I
The South Vs. The South: How Anti-Confederate Southerners Shaped the Course of the Civil War
What Hath God Wrought: The Transformation of America, 1815-1848 (Oxford History of the United States)
Free Soil, Free Labor, Free Men: The Ideology of the Republican Party before the Civil War
Hannibal: A History of the Art of War among the Carthaginians and Romans down to the Battle of Pydna, 168 B.C., with a detailed account of the Second Punic War