Answer: I think the answer is D. The announcement of the Emancipation Proclamation. Hope this helps!
Coolie was a pejorative word for Chinese indentured laborers, whose living conditions were similar to slavery.
Being a slave, who is unable to leave the duty they are performing for an enslaver and who is treated as the enslaver's property, is both the state and the condition of being an enslaved person. Typically, slavery entails the enslaved individual being forced to labor and having their location or place of residence determined by the enslaver.
Many historical instances of slavery took place as a result of criminal activity, debt, or military loss; other types of slavery were established along demographic lines, such as race. A person may be held in captivity for all of time or for a certain amount of time before being released.
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Between 1066 and 1071 CE, William the Conqueror (r. 1066-1087 CE) led the Norman conquest of England, which lasted five years. The Normans were here to stay thanks to hard-fought wars, castle construction, land redistribution, and scorched-earth tactics. The Norman elite replaced the Anglo-Saxon elite and took over the country's territories, and the Church was restructured as a result of the conquest.