 Iceland's principal historical international disputes involved disagreements over fishing rights.Conflict with the United Kingdom led to a series of so-called Cod Wars, which included confrontations between the Icelandic Coast Guard and the Royal Navy over British fishermen, in 1952–1956 due to the extension of Iceland's fishing zone from , 1958–1961 following a further extension to , 1972–1973 with another extension to ; and in 1975–1976 another extension to .According to the 2011 Global Peace Index, Iceland is the most peaceful country in the world, due to its lack of armed forces, low crime rate and high level of socio-political stability.