Commentary Mark Twain copied a friend’s remark into his notebook: “I am not an American; I am the American.” That is a claim—to be the American, the exemplary or representative American—that very few Americans could plausibly make. Twain himself could. Benjamin Franklin could and did. Abraham Lincoln could but didn’t, though admirers made the claim for him. Surely some number of others could, too. But among all Americans past or present, no one could make such a claim more compellingly than Frederick Douglass. Like his country, Douglass rose from a low beginning to a great height. Like his country again, he won his freedom in a revolutionary struggle, by his own virtue and against great odds, and he matured into an exemplar of universal liberty, admired the world over. And like his country, finally, Douglass the individual was divided by race. Unlike America, Douglass could hardly think of himself as “conceived in liberty.” But even in …