What are the euphemisms for the racist word “niger”?

What are the euphemisms for the racist word “niger”?
【正确答案】：In the United States, the black people were often referred to by the white racists as nigers. Negroes was an euphemism at that time. Then the black people was used to replace it.
【题目解析】：参见教材P267。
掌握“Euphemisms”知识点。