Thomas Cripps reasons that in some respects, the film undercuts racial stereotypes; in particular, the film created greater engagement between Hollywood and black audiences, with dozens of films making small gestures in recognition of the emerging trend. Only a few weeks after its initial run, a story editor at Warner wrote a memorandum to Walter Wanger about "Mississippi Belle", a script that contained the worst excesses of plantation films, suggesting that "Gone with the Wind" had made the film "unproducible". More than any film since "The Birth of a Nation", it unleashed a variety of social forces that foreshadowed an alliance of white liberals and blacks who encouraged the expectation that blacks would one day achieve equality. According to Cripps, the film eventually became a template for measuring social change.