Due to the high concentration of first-generation immigrant families in the inner city of Chicago during the early 20th century, many prominent early studies in urban sociology focused upon the transmission of immigrants' native culture roles and norms into new and developing environments. Political participation and the rise in inter-community organizations were also frequently covered in this period, with many metropolitan areas adopting census techniques that allowed for information to be stored and easily accessed by participating institutions such as the University of Chicago. Park, Burgess and McKenzie, professors at the University of Chicago and three of the earliest proponents of urban sociology, developed the Subculture Theories, which helped to explain the often-positive role of local institutions on the formation of community acceptance and social ties. When race relations break down and expansion renders one's community members anonymous, as was proposed to be occurring in this period, the inner city becomes marked by high levels of social disorganization that prevent local ties from being established and maintained in local political arenas.