A, B, C, D
(everything except the last answer)
Answer:
Slave Revolts, Abolition, and the Underground Railroad. Nat Turner's Rebellion. ...
Reconstruction. Resistance to Black Codes. ...
Early 20th Century. Rise of Pan-Africanism. ...
The Southern Civil Rights Movement.
Explanation:
Well, it decreased the demand of Slave Labor.
Back then, the technology advancement , especially in agricultural sector, significantly increased the total production. This cause the demand of overall labor decreased. The northern US, who utilized more of this advancement more than their southern neighbor, manage to produce hundred times more output than the southern who still depended on their slave labor
D Rosetta Stone
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