The United States Peace Index ( USPI ) is a measurement of states and cities in the US by their peacefulness. Created by the Institute for Economics and Peace , the creators of the Global Peace Index , it is said to be the first in a series of National sub-divisions by their peacefulness. The USPI was created first due to plentiful data and a large amount of diversity between states for level of peace. The United States ranked 88/158 on the Global Peace index for 2012. The U.S. index was released on 6 April 2011 and the second edition was released on 24 April 2012.
1-663: There are five peace indicators that make up the USPI The index also includes a map and list for changes in peacefulness from 1991–2009. States are scored in this section by percent, either positive or negative. As a nation, it says that the United States has improved in peacefulness since 1991. The index also provides statistical analysis and crime, and the cost of crime, in the 61 most populous metropolitan areas. The Cambridge metro area in Massachusetts ranked as
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