According to hickey half of all serial killers in the united states have emerged since what year

1975

A serial killer is a person who murder three of more people. With no apparent motive, he commits a series of murders following a predictive behavior pattern.

According to Dr. Eric W. Hickey, a popular forensic psychologist who studies psychologists, roughly half of all identified serial killers in the United States have surfaced since 1975.

industry had made the u.s. the richest nation in the world at this time. the second industrial revolution caused growth in industry and transportation, which allowed increased trade between nations.

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