One source (Wikipedia)A major contributor to the high incarceration rates is the length of the prison sentences in the United States. One of the criticisms of the United States system is that it has much longer sentences than any other part of the world. The typical mandatory sentence for a first-time drug offense in federal court is five or ten years, compared to other developed countries around the world where a first time offense would warrant at most 6 months in jail.[26] Mandatory sentencing prohibits judges from using their discretion and forces them to place longer sentences on nonviolent offenses than they normally would do.
Even though there are other countries that commit more inmates to prison annually, the fact that the United States keeps their prisoners longer causes the total rate to become higher. To give an example, the average burglary sentence in the United States is 16 months, compared to 5 months in Canada and 7 months in England.
Looking at reasons for imprisonment will further clarify why the incarceration rate and length of sentences are so high. The practice of imposing longer prison sentences on repeat offenders is common in many countries but the three-strikes laws in the U.S. with mandatory 25 year imprisonment — implemented in many states in the 1990s — is extreme compared to countries in Europe.
Other sources (
http://www.economist.com/blogs/economist-explains/2013/08/economist-explains-8)
Probably the biggest driver of this growth has been ever-harsher drug penalties. In response to the crack epidemic of the 1980s, Congress and state legislatures began passing laws that meted out mandatory-minimum sentences for drug-related crimes. These were intended to help nab major traffickers, but the sentences were triggered by the possession of tiny quantities of drugs: five grams of crack, for instance, resulted in a mandatory-minimum sentence of five years. Conspiracy laws made everyone involved in a drug-running operation legally liable for all of the operation’s activities: a child hired for a few dollars a day to act as a lookout at the door of a crack house was on the hook for all the drugs sold in that house and all the crimes associated with their sale. These sorts of laws kept America’s prison population growing even as its crime rate declined.
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