The “Philadelphia Negro” Then and Now: what was DuBois’s stance or his “moral convictions” that the author notes influenced his research?what specific effect did it have?

The “Philadelphia Negro” Then and Now What was DuBois’s stance or his “moral convictions” that the author notes influenced his research? What specific effect did it have? Describe this in detail and quote or paraphrase the author (please include page numbers when you do).