The object that provides the title for the new movie Green Book is a Jim Crow-era travel guide with extensive listings of hotels, restaurants, gas stations, shops and tourist facilities that welcomed black patronage. The book doesn’t actually get much screen time, but one small moment in the film shines a light on an oft-forgotten truth about the history of segregation in the United States: this was not just a Southern problem. The film tells a loose version of the true story of an unlikely friendship between Dr.