According to some scholars, such as Peter Lang, continued cultural hypersegregation in the 1980s led to the common belief, by many American white people, that the nation had reached a post-racial state of social relations, which resulted in a backlash against the racial and ethnic diversity of the cinema of the previous decades, on screen during the 1960s and the 1970s; thus, the popular cinema of the 1990s and the early 2000s featured the white savior narrative. That reappearance of the white-savior narrative occurred because the majority of white people in the United States had little substantive social interaction with people of different races and ethnic groups. The White Savior trope's prevalence continues in often critically acclaimed films. Joseph Vogel writes of the trope in "Django Unchained":In the crucial climactic scene, the pattern of white centrality holds. It is [the white doctor] Schultz, not [the freed slave] Django, who, racked by conscience kills Calvin Candie, and in doing so, sacrifices his own life. When asked by Henry Louis Gates, Jr. why he decided to make King Schultz the Christ figure, Tarantino claimed he was simply drawing on the tropes of the western.A study of 50 films between 1987-2011 found that 36% of studied films were produced by the 6 major studios (Sony, Universal, Paramount, Twentieth Century Fox/Fox Searchlight, or Warner Brothers). These films are also responsible for a plurality of the major awards in this time period. The white-savior teacher story, such as "Up the Down Staircase" (1967), "Dangerous Minds" (1995), and "Freedom Writers" (2007), "features a group of lower-class, urban, non-whites (generally black and Latino/a) who struggle through the social order in general, or the educational system specifically. Yet, through the sacrifices of a white teacher they are transformed, saved, and redeemed by the film's end." As an inspirational tale of the human spirit, the storyline of the white-savior-teacher is not racist, in itself, but is culturally problematic for being racialist, because it is a variant of the white-savior narrative that factually misrepresents the cultural and societal reality that there exist minority-group teachers who have been successfully educating (racial, ethnic, cultural) minority-group students in their communities, without the saving stewardship of white people. The white savior's principled opposition to chattel slavery and to Jim Crow laws makes him advocate for the humanity of slaves and defender of the rights of black people unable to independently stand within an institutionally racist society, in films such as "To Kill a Mockingbird" (1962), "Conrack" (1974), and "Amistad" (1997).