What in twentieth-century American history had the biggest impact on Barack Obama's presidential victory in 2008?

Question

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The civil rights movement of the 1960s had a profound impact on American society, breaking down racial barriers and paving the way for increased political and social participation by African Americans. This movement laid the groundwork for Barack Obama's presidential victory in 2008, as it significantly shifted public attitudes and policies regarding race and equality in the United States.

What in Twentieth-Century American History Had the Biggest Impact on Barack