Discussion of these factors inevitably involves a discussion of race, because most of the factors that seem to lead to crime are disproportionately concentrated among black Americans and thus this relatively small group's condition and experiences disproportionately affect the crime problem affecting the nation as a whole. The available data show steadily increasing rates of violence in the United States since the mid-1950's. However, the more serious types of crime are less common than less serious forms. Crime is disproportionately concentrated among youthful males, particularly those under age 25. Blacks are also overrepresented in those arrested for violent crimes. Their overrepresentation in the group aged 15 to 24 has contributed to increases in the national crime rate over time. Data on economic hardship also suggest direct and indirect connections between local factors and local rates of property and violent crime. Finally, social disorganization as indicated by illegitimacy, teenage mothers, divorce, and single-adult families all show connections with trends in violent crime. Overall, the changes in the age structure suggest that violent crime will decrease for the rest of the century, but that the racial distribution of high-risk individuals and the worsening economic conditions and family disorganization among whites as well as blacks and Hispanics will increase the group at risk and increase crime rates. Figures and reference notes.