What 1930s movie most solidified blacks in the roles of servants in the American mind?

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"Gone with the Wind" is considered to be the most influential film in solidifying the racial stereotype of African Americans as being subservient and inferior. The film takes place during the Civil War and Reconstruction era and features black characters as loyal and dependent servants to their white masters. The film was immensely popular and widely distributed, reaching a mainstream audience and perpetuating the stereotype of black subservience for decades to come.

What 1930s Movie Most Solidified Blacks in the Roles of Servants