President Trump's chief of staff John Kelly ignited a controversy with his recent remarks about the American Civil War made during an interview with Fox News. Kelly said "the lack of an ability to compromise led to the Civil War" and called Robert E. Lee an "honorable man." Civil war historians have refuted Kelly's account, with one Columbia University professor calling it "the Jim Crow version of the causes of the Civil War." In this hour Forum discusses the cause of the civil war, how it is taught in schools and why it remains such a polarizing topic.