What attitudes toward American life and toward racial differences are assumed in the text?

在其内容中对美国生活和种族差异作了哪些假设？

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Du Bois composed his text during Jim Crow, a time of official racial segregation that deliberately obscured to the wider world the human details of African-American life.

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But the book does not climax, as a standard historical text might, with South Africa's first proper multi-racial elections in 1994.

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