ms. nurridin: the first half of the 20 century. he has a long career. one of his most important works that he'sed in 1904, riding until his death until the 1960's. he is covering a broad range. think what impact do you he ultimately had on society and black history in america? ms. nurridin: he is a pivotal figure. one of the architects of the black intellectual tradition. not alone, but because he was such a prolific author he really influenced a lot of disciplines. effectseally important on the discipline of sociology. considered one of the founders of modern sociology as we understand it today. he has a broad impact. a lot of scholars read him because he is the foundation for a lot of thought in the 20th century. he has this really important intellectual impact, but as far as the history of eugenics he is one blip on a radar of a larger discourse. susan: you mentioned margaret sanger. who was she and what role did she play in the field of eugenics and black american population? we sort of think back on her as the founder of what now is planned parenth