Have you read "Pastwatch: The Redemption of Christopher Columbus" by Orson Scott Card? It get's a little weirdly preachy, but the idea that Columbus really is

Have you read "Pastwatch: The Redemption of Christopher Columbus" by Orson Scott Card? It get's a little weirdly preachy, but the idea that Columbus really is the fulcrum about which the fate of the Americas tips, and that if you could go back and get him to think of the locals as actual people and not savages, things could work out pretty good.