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U.S. Slavery: Timeline, Figures & Abolition | HISTORY
Slavery - Wikipedia
Slavery | Definition, History, & Facts | Britannica
SLAVE中文(简体)翻译:剑桥词典 - Cambridge Dictionary
History of slavery - Wikipedia
奴隶制度 - 维基百科,自由的百科全书
Slave trade | Definition, History, & Facts | Britannica
African Americans - Slavery, Resistance, Abolition | Britannica
A Brief History of Slavery That You Didn't Learn in School
How slavery flourished in the United States - National Geographic