The Great Migration had more of a positive effect on America because it brought about significant social, cultural, and economic changes. During this period, millions of African Americans moved from the rural South to urban areas in the North and West, seeking better opportunities and escaping racial discrimination. This mass movement contributed to the growth of vibrant African American communities, the development of influential cultural movements like the Harlem Renaissance, and the expansion of the industrial workforce. The Great Migration played a crucial role in shaping the diversity and richness of American society.