More than that, The Sneetches taps into one of the fears that segregationists held, and which was represented as an ever-present danger in the Northern as well as the Southern states: the fear of “passing.” In a country where “one drop of African blood” made a person black and not white, worries about being able to place people in the racial hierarchy if they could “pass” for white emerged through various forms of cultural production. Mark Twain, Charles Chestnutt, and Nella Larsen all wrote novels about African-Americans passing for white. The 1930s musical “Showboat,” twice made into a film (in the 1930s and the 1950s), has a tragic plot involving passing. Another film, based on a Fannie Hurst novel, was made twice by Hollywood (again in the 1930s and the 1950s). “Imitation of Life,” in its second incarnation became the fourth-most successful movie of 1959—just two years before The Sneetches was published.
Karen Sands-O’Connor, “Dr. Seuss and Racial Passing,” theracetoread: Children’s Literature and Issues of Race, February 11, 2015. https://theracetoread.wordpress.com/2015/02/11/dr-seuss-and-racial-passing.