Title: Pastwatch
Description: From back cover Tor paperback February 1997:

In one of the most powerful and thought-provoking novels of his remarkable career, Orson Scott Card interweaves a compelling portrait of Christopher Columbus with the story of a future scientist who believes she can alter human history from a tragedy of bloodshed and brutality to a world filled with hope and healing.
Subjects: Fiction, Christopher columbus in fiction, Discoveries in geography, Discoveries in geography in fiction, Time travel in fiction, America in fiction, Explorers in fiction, Explorers, Time travel, Discovery and exploration, Spanish, Spanish Discovery and exploration, Fiction, science fiction, general, Fiction, general
Places: America
People: Christopher Columbus