In an opinion piece in today's New York Times a professor of sociology at Harvard, Robert J. Sampson, claims that increased immigration is a major factor in the decrease in the crime rate the US has experienced over the last 15 years.
"Consider what sociologists call the 'Latino paradox': Hispanic Americans do better on a range of various social indicators — including propensity to violence — than one would expect given their socioeconomic disadvantages. My colleagues and I have completed a study in which we examined violent acts by almost 3,000 males and females, ranging in age from 8 to 25, from 1995 to 2003. The study selected whites, blacks and Hispanics (primarily Mexican-Americans) from 180 Chicago neighborhoods ranging from highly segregated to very integrated. We also analyzed data from police records, the Census and a separate survey of more than 8,000 Chicago residents who were asked about the characteristics of their neighborhoods."
See the complete article at http://tinyurl.com/rudw2