Final answer:
Du Bois is credited with the application of the critical perspective to studying the city, which provided empirical evidence to challenge pseudoscientific ideas of biological racism.
Step-by-step explanation:
While his approach was drawn from previous research, Bois is credited with the application of the critical perspective to studying the city.
His scientific approach became highly influential to entire schools of sociological study, and is considered a forerunner to contemporary practices.
Du Bois' publication provided empirical evidence to challenge pseudoscientific ideas of biological racism, which had been used as justification to oppress people of different races.