"The 2010 rankings are here! This year 149 nations of the world have been ranked by their peacefulness and the results have stimulated some very interesting analysis." (The work is named the "Global Peace Index" - http://www.visionofhumanity.org/).
I blogged about this last November, looking at stats for 2009. Last year the U.S. ranked #83 out of 144 countries. For 2010, the U.S. ranked #85 out of 149 countries. To see the factors that are taken into account when ranking, go to: http://www.visionofhumanity.org/about/, and in the left-hand side bar, click on "Peace Indicators"; also click on "Related Indicators". For the second year in a row, New Zealand is #1. Iraq is the least peaceful (#149), Afghanistan is at #147, and Israel is at #144.
Endorsers of the Global Peace Index effort can be seen at: http://www.visionofhumanity.org/info-center/endorsers/