  In chapter 6 of Dusk of Dawn, entitled “The White World,” Du Bois imagines a dialogue between himself and a fictional interlocutor, Roger Van Dieman. Near the conclusion of the exchange, Du Bois says that “[r]ace is a cultural, sometimes an historical fact,” to which Van Dieman responds “But what is this group [the black race] and how do you differentiate it” (1940, 77). Du Bois rejoins his interlocutor, remarking that he recognizes “it [the black race] quite easily and with full legal sanction; the black man is a person who must ride Jim Crow in Georgia” (1940, 77).