The story of Jackie Robinson valiantly breaking baseball's color barrier in 1947 is one most Americans know. But less recognized is the fact that some seventy years earlier, following the Civil War, baseball was tenuously biracial and had the potential for a truly open game. How, then, did the game become so firmly segregated that it required a trailblazer like Robinson? The answer, Ryan A. Swanson suggests, has everything to do with the politics...