Andrew Delbanco’s The War Before the War is published this month. He shares five classic American novels he enjoys teaching, noting, “I’ve been teaching classic American literature to college students for almost 40 years, and while some books have been banished from the category of ‘classic’ and others have been invited in, certain works continue year after year to disturb, confuse, delight, or devastate my students—or, more likely, all of the above.”