"Repatriation" is a term that signifies a person returning something to its owner, either with force or voluntarily. In historical terms, it is generally returning loans or refugees & Immigrants.
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B and D??? Sorry if incorrect but its my best guess
Answer - Many of these men were unofficially allowed to enlist in the Union Army. After President Abraham Lincoln's Emancipation Proclamation, Jan. 1, 1863, black Soldiers were officially allowed to participate in the war. hopes this helps :)
There!!!!! Hope it help you