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b. why does the harlem renaissance hold such significance in us history despite its fading influence during the great depression?

The Harlem Renaissance is a term for the period of thriving cultural activity that occurred in New York City's Harlem district between the World Wars, that is, from the early 1920s to the early 1930s. The movement's foreground figures were poets, writers, intellectuals and musicians such as Duke Ellington, Billie Holiday and Josephine Baker, who laid the foundation for their international careers. The Harlem Renaissance was characterized by a belief that art could have an effect on social ills. The movement was influential on the ongoing African-American civil rights struggle and contributed to a stronger self-esteem and identity of blacks in the United States.  

The movement died out sometime around 1930, but the researchers dispute what the causes of this were, but probably it was a radically changed social climate due to the Great Depression.