In 1990, there were about 3.5 million foreigners living in this country illegally, and the national murder rate was 9.4 per 100,000 people. When the population of immigrants here illegally peaked at 12.2 million in 2007, the murder rate was 5.6 per 100,000 — a decline of 40 percent — and it has fallen more since then.
Far from generating crime, this group appears to suppress it. A groundbreaking new state-by-state study covering 1990 to 2014 by sociologists Michael Light of the University of Wisconsin at Madison and Ty Miller of Purdue in the journal Criminology concludes that “undocumented immigration over this period is generally associated with decreasing violence.”
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