US Peace index, by state (Discontinued)
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The 2012 United States Peace Index (USPI) has found that the U.S. is more peaceful now than at any other time over the last twenty years.
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Knoema创建时间：
2012-07-31
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The 2012 United States Peace Index (USPI) has found that the U.S. is more peaceful now than at any other time over the last twenty years.