The Tales of Alvin Maker (book 1 and 2) by Orson Scott Card

Book 1: The Seventh Son by Orson Scott Card Book 2: Red Prophet by Orson Scott Card "The stories take place on the American frontier in the early 19th century, a fantasy setting based on early American folklore and superstition, in a world in which folk magic actually works and manifests differently by race, and many Caucasian characters have a limited supernatural ability, or “knack,” to do some task to near-perfection, while Native Americans manifest nature magic and people of African ancestry can work voodoo. The stories involve a number of historical events and figures, but as a creation of alternate history. The primary divergence is the survival of Oliver Cromwell from the illness that killed him in reality, thanks to a physician secretly having a magical healing knack (Cromwell considered such knacks evil witchcraft). "

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