Title: Crime drop - Wikipedia
Headings: Crime drop
Crime drop
Contents
Historical context
Decline since the Middle Ages in Western Europe
Increase between the late 1950s and early 1990s
Global level
Homicide rates as comparative value
Decline since the early 1990s
Development by region
Germany
United States
Proposed explanations
Lead
Air pollution
Abortion
Drug use and demand
Economic factors
Immigration
Incarceration
Policing
Security hypothesis
See also
References
Further reading
External links

Content: the civil, women's, and gay rights movements; economic transformations including the OPEC oil embargoes of the 1970s, massive economic restructuring, and globalization; and vastly increased movements of people between countries. Fukuyama argues, in retrospect this has been all too much to be absorbed in a short time. Another explanation proposes that the international homicide decline is partially a consequence of the aging of populations around the world, which is causing a reduction in the size of the youth relative to other age groups. Since youth tend to commit the majority of violent crimes, and since older members of societies tend to be the more orderly and peaceful, as populations grow older their violence rates tend to decline. However, the most violent countries are not yet enjoying the pacifying benefits of the aging of their populations because other strong criminogenic forces are interfering with their homicide trends. Lead
The lead–crime hypothesis proposed a link between elevated blood lead levels in children and later increases in crime. Children exposed to forms of lead at young ages are hypothesized to be more likely to develop learning disabilities, attention deficit hyperactivity disorder, and problems with impulse control. These problems are suggested to lead to the commission of more crimes as these children reach adulthood, especially violent crimes.