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Why did slavery continue after the revolution?

Aslave labor was important to the New Ingland economy
BThe colonial government encouraged manumission
CThe British, Loyalists, and Patriots all agreed that liberty did not extend to slaves
DThe Southern plantation economydepended on slavery

Verified Answer :

"d. The Southern plantation economy depended on slavery" is the best option from the list, since although slavery continued to exist to some extent in the North it was the South's primary source of labor. 

d. The Southern plantation economy depended on slavery" is the best option from the list,