Questions about the Justification of prejudice in as detail as possible

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Please somebody help me…

Please respond to some questions about the Justification of prejudice in as detail as possible. (As you know, it is 3 dollars for one question, please tell me in detail)

 

Q1. In what ways have US historical narratives (e.g., slavery, native genocide, Latin American colonialization, Japanese internment, civil rights movement, Vietnam way, Middle East wars, etc.) been forgotten or reinterpreted in ways that likely rationalize bias? (If you do not mind and it is possible, please tell me the topic of slavery in as detail as possible.)

Q2. When, where, how, and why did it happen?