The United States is among the least peaceful nations in the world, ranking 96th between Yemen and Iran, according to an index of 121 countries.

According to the Global Peace Index, created by the Economist Intelligence Unit, Norway is the most peaceful nation and Iraq is the least, just after Russia, Israel and Sudan.

The index was compiled based on 24 indicators. They included the number of wars in which a country was involved, arms sales, violent crimes and relations with neighboring countries.

Fifteen of the top 20 most peaceful nations are in Western Europe, and higher income appeared to lead to higher levels of peace.