Social pressures in the United States are explained in the context of group identification and group behavior. The urban scene is made up of a number of groups, or subcultures, which have parallel structures along socio-economic, and nationality-color-ethnic lines. These groups act as if they had a structured plan. It is shown how this plan is…

Examined the interrelations of group contextual factors and the occurrence of aggressive behavior in 22 experimental play groups of 7- and 9-year-old African American boys. Found that negative affect, high aversion behavior, high activity level, low group cohesion, and competitiveness were related to the occurrence of aggressive behavior. (MDM)