Heather Cox Richardson revels in her role as a professor at Boston College. She is a white woman, 58 years of age and a resident with her partner, a lobsterman, in a small fishing village in Maine. A prolific author and essayist, she has written her sixth book, “How the South Won the Civil War.” Therein, she provides a clear analysis of America’s unsettling paradox: Paeans to freedom strike dissonant notes when sounded amidst human slavery and where structural injustices are extant. ...