Final answer:
Artists began challenging stereotypes of African-Americans during the postwar era, intensifying their efforts during the Civil Rights Movement of the 1960s and 1970s. They created new platforms for African-American art and recontextualized black representation in history and culture with the support of academics and community leaders.
Step-by-step explanation:
Artists began to overtly challenge the truthfulness of stereotypes concerning blacks during the postwar years, with a significant rise in awareness and rejection of these stereotypes throughout the Civil Rights Movement in the 1960s and 1970s. The movement led to an emergence of African-American artists who started to challenge the canon by producing works that captured and expressed changes in societal attitudes towards race. They found ways to celebrate black culture and challenge preconceived notions through their art, opening galleries and establishing community art centers for African-American works. Additionally, scholars helped redefine historical perceptions and fought against the stereotypical 'black-slaves in perpetuity' image that had been accepted in Western culture.
In conjunction with these efforts, Lisa E. Farrington highlighted the long history of African-American protests against systemic racism and injustice since slavery was first legalized. Artists and scholars alike have worked to provide a more accurate and contextual representation of Black people, both in history and in art, striving towards self-determination and the rejection of oppressive characterizations.