While doing his research, was critical of successful african americans who turned their backs on those who were less successful. pioneered the study of urban sociology and race relations in the u. s. while at the university of chicago.

Urbanization and

Robert Park, Louis Worth and Earnest Boggess

Explanation:

Robert Park, Louis Worth and Earnest Boggess: these are the pioneers of the inner city of Chicago revolutionized not only the purpose of urban research in sociology, but also the development of human geography through its use of quantitative and ethnographic research methods. The importance of the theories developed by the Chicago School within urban sociology have been critically sustained and critiqued but still remain one of the most significant historical advancements in understanding urbanization and the city within the social sciences.

they produces sugar..

hope this , question was a little open ended