What if history had taken a different turn?
From Roman historians imagining Alexander the Great's survival to modern tales of butterfly-induced fascism, the 'what if' genre explores the fragile threads of our reality. Discover how authors use a single point of divergence to reshape the entire course of human civilization.
Alternate history is a subgenre of speculative fiction defined by a 'point of divergence' (PoD)—a specific moment where a historical event deviates from the actual record. To be effective, these stories require a change that alters subsequent history and a thorough examination of the resulting ramifications. While often associated with science fiction, the roots of this speculative thinking are ancient. The Roman historian Livy contemplated a 4th century BC where Alexander the Great survived to invade Europe, while the 11th-century theologian Peter Damian explored whether God could have prevented the very founding of Rome.
The genre has evolved through various complex mechanisms. Early works like Joanot Martorell’s 1490 epic *Tirant lo Blanch* imagined a world where the Byzantine Empire was saved from Ottoman conquest. By the 19th century, Louis Geoffroy’s work envisioned a global Napoleonic empire. Later, the 20th century introduced more complex tropes: H.G. Wells popularized the idea of traveling between parallel worlds, and Murray Leinster’s 1934 story 'Sidewise in Time' introduced the concept of Earthly pieces trading places with their analogs from different timelines.
Modern iterations often use time travel as the catalyst for divergence. Ray Bradbury’s 1952 story 'A Sound of Thunder' famously illustrates the 'butterfly effect,' where a single accidental death in the Cretaceous period leads to a fascist presidency in the present. Some narratives even explore 'recursive' history, such as Winston Churchill’s essay imagining a Confederate victory at Gettysburg, or stories where characters attempt to 'thicken' the stack of universes where good things happen by making better choices, as suggested by the many-worlds interpretation of quantum mechanics.
Source: Alternate history
