„Treat the negro as a citizen and a voter, as he is and must remain, and soon parties will be divided, not on the color line, but on principle.“

— Ulysses S. Grant

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„The Negro cannot stand the present reactionary tendencies and unreasoning drawing of the color line indefinitely without discouragement and retrogression. And the condition of the Negro is ever the cause for further discrimination.“
— W.E.B. Du Bois
„The problem of the twentieth century is the problem of the color line.“
— W.E.B. Du Bois