The power of the American press to influence and even set the political agenda is commonly associated with the rise of such press barons as Joseph Pulitzer and William Randolph Hearst at the turn of the century. The latter even took credit for instigating the Spanish-American War. Their power, however, had deeper roots in the journalistic culture of the nineteenth century, particularly in the social and political conflicts that climaxed with the Civil War. Until now historians have paid little attention to the role of the press in defining and disseminating the conflicting views of the...