explain why the person, place and time of the recording can effect the value of a source to a historian

Before 2010, haitian refugees were returned to their country without asylum hearings because

How did political revolutions in the atlantic ocean basin affect or alter the institution of slavery and the lives of slaves

How did african americans the union during the civil war? a. by serving as representatives in congress b. by enlisting in the military to fight c. by organizing massive slave revolts in the south d. by negotiating for peace with the confederacy