As "Savior of the Union" and the "Great Emancipator," Abraham Lincoln has been lauded for his courage, wisdom, and moral fiber. Yet Frederick Douglass's assertion that Lincoln was the "white man's president" has been used by some detractors as proof of his fundamentally racist character. Viewed objectively, Lincoln was a white man's president by virtue of his own whiteness and that of the culture that produced him. Until now, however, historians have...