In low-income U.S. cities, street fights between teenage girls are common. These fights take place at school, on street corners, or in parks, when one girl provokes another to the point that she must either “step up” or be labeled a “punk.” Typically, when girls engage in violence that is not strictly self-defense, they are labeled “delinquent,” their actions taken as a sign of emotional pathology. However, in Why Girls Fight , Cindy...