The passage suggests which of the following about histories of the Civil War written before 1930? A. Some took a fairly sympathetic view of Southern Unionists. B. Interest in these histories has been revived by the work of recent historians C. Most offered little analysis of the lives and motives of Southern Unionists. D. Many tended to group Southern Unionists into broad categories that obscured their differences. E. Few accepted the idea that the South was politically unified during the Civil War.