- (2009 - 2014) "The War That Came Early" series of novels, beginning with "Hitler's War", where World War II begins one year earlier than in reality.
- (2011 - 2013) "Supervolcano" trilogy of novels, where the Yellowstone Caldera erupts.
- (1995) "The Two Georges", novel co-written with Richard Dreyfuss, where the American colonies remained part of the British Empire as late as the 20th century.
- (1992) "Guns of the South", novel. Time traveling AK-47 weapons allow the Confederate States to win independence in 1864.
- (2002) "Ruled Britannia", novel where Spain conquered England in 1588.
- (1997 - 2007) "Southern Victory" series of novels. (The title is unofficial and given by fans.) Beginning with "How Few Remain", this has the Confederate States win independence in 1862, and continue to be an imperialist rival of the USA in the 20th century.
- (2003) "In the Presence of Mine Enemies", novel where the Nazis won WWII and gradually spread across most of the world.
- (1994 - 2004) "Worldwar," series of novels, beginning with "In the Balance", about a "War of the Worlds" style invasion interrupting WWII.
- (1987 - 2005) "Videssos" series of novels, beginning with "The Misplaced Legion", about soldiers of Gaio Giulio Cesare transported to a fantasy world. Originally conceived as a J.R.R. Tolkien fan fiction.
- (2015) "Joe Steele", novel where Joseph Stalin's parents emigrated to the USA before his birth, making him eligible to be the American President.
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