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"Historical divergence" is a book category that explores counterfactual or alternate-history scenarios by introducing a clear point of divergence from real-world events and then imagining the plausible political, social, cultural, and technological consequences that follow. These works range from rigorous, historically grounded what-if narratives to far-reaching speculative reworkings of entire eras, and they can be focused on single events (a different outcome to a battle or election) or on broader shifts (different colonization patterns, technologies, or ideologies). The genre emphasizes cause-and-effect—how one change cascades into altered institutions, everyday life, and identities—while allowing authors to probe themes of contingency, power, morality, and identity, and to blend historical research with worldbuilding and character-driven storytelling.

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