Question: What is the name of the social movement depicted in Jacob Lawrence's paintings that involved millions of African-Americans moving out of the rural Southern United States?
Sentence (from "Barnett-Aden Gallery"): ...there were few such opportunities in the years following World War II...in those bleak years, the Barnett-Aden Gallery was one of the few private galleries where Black painters, sculptors and graphic artists had a continuing opportunity to expose their works.”
Relevant evidence: No