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- african american abolitionists (3)
- douglass, frederick, (3)
- history (3)
- slavery (3)
- slaves (3)
- social conditions (2)
- abolitionists (1)
- assimilation (sociology) (1)
- biography (1)
- forced migration (1)
- jacobs, harriet a (1)
- migrant labor (1)
- migration, internal (1)
- political aspects (1)
- slave trade (1)
- southern states (1)
- women slaves (1)
- 军事 (1)
- 军事科学-竞赛题 (1)
- 基本知识 (1)
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