The Story of the Federated Commonwealths, written by the historian Ernest Simpson, is a history of English expansion into North America that eventually led to the birth of the Federated Commonwealths of America. Much of the book is devoted to the history of sims as observed by humans, and the effect that close proximity had on both species.

Literary commentEdit

Excerpts from the fictional book serve as an important exposition device at the beginning of each story in A Different Flesh, revealing plot points and backstories which could not otherwise be fit into the narrative.