In the 1990s, homicide and violent crime dropped dramatically in New York City but not in Chicago. No single factor can fully explain the reasons for Chicago's persistently high rates of violence. Our data suggest Chicago's homicide rate stayed high while New York City's dropped because of: 1) Continuing disputes over drug markets by Chicago's institutionalized gangs; 2) Police tactics that fractured gang leadership; and 3) Surprisingly, displacement caused by the demolition of public housing Our studies have concluded that a city's housing policy is one crucial component in any effective effort to reduce violence.
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