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题目材料：
Researchers once widely concurred that the typical participant in the Great Migration (approximately 1910-1970), which brought vast numbers of African Americans from the southeastern United States to northern cities, was an illiterate sharecropper fleeing the rural South's distressed agricultural economy. However,researchers are increasingly recognizing that the stream of Black migrants was probably more diverse than previously supposed. Marks argues that many migrants headed north from southern towns and cities rather than from rural areas and had more extensive experience with nonagricultural employment than was typically assumed. Additional research shows that Black migrants had significantly higher levels of education than the nonmigrating southern Black population, although the migrants generally had lower levels of educational attainment than did Black populations already living in the North.
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