New Zealand is the second most peaceful contry in the world, according to Vision of Humanity's inaugural Global Peace Index. We were pipped for the top spot by Norway, due to our higher crime rate. By contrast, Australia came in 25th place, the UK 49th, and the US 96th, just one place ahead of its next victim, Iran. The bottom country was (of course) Iraq, followed by Sudan and Israel.
The big trend visible immediately from the map is that Europe is (for once in its history) overwhelmingly peaceful. Which I think shows both the lesson learned from the first and second world wars, and the value of the EU as an institution in preventing future conflicts amongst its members.