In "douglass" when was douglass's voice heard by the nation

He is writing a poetry when partiality against African Americans might have been climbing up to northern and southern districts of the united States, Dunbar made poetry that debated the unflattering picture for as much people discovered for magazines and daily papers. He picked up national noticeable quality Similarly as An artist Eventually Tom's perusing the transform of the twentieth century. 
His voice heard by the nation and appreciated because its themes and values effected by the historical period of that time with very good way.