Iceland

On 31 December 1943, the Danish–Icelandic Act of Union expired after 25 years. Beginning on 20 May 1944, Icelanders voted in a four-day plebiscite on whether to terminate the personal union with Denmark, abolish the monarchy, and establish a republic. The vote was 97% to end the union, and 95% in favour of the new republican constitution. Iceland formally became a republic on 17 June 1944, with Sveinn Björnsson as its first president.
In 1946, the Allied occupation force left Iceland. The nation formally became a member of NATO on 30 March 1949, amid domestic controversy and riots. On 5 May 1951, a defence agreement was signed with the United States. American troops returned to Iceland as the Iceland Defence Force, and remained throughout the Cold War. The US withdrew the last of its forces on 30 September 2006.
Iceland had prospered during the war. The immediate post-war period was followed by substantial economic growth, driven by industrialisation of the fishing industry and the US Marshall Plan programme, through which Icelanders received the most aid per capita of any European country (at USD 209, with the war-ravaged Netherlands a distant second at USD 109).
The 1970s were marked by the Cod Wars — several disputes with the United Kingdom over Iceland's extension of its fishing limits to 200 miles offshore. Iceland hosted a summit in Reykjavík in 1986 between United States President Ronald Reagan and Soviet Premier Mikhail Gorbachev, during which they took significant steps toward nuclear disarmament. A few years later, Iceland became the first country to recognize the independence of Estonia, Latvia, and Lithuania as they broke away from the USSR. Throughout the 1990s, the country expanded its international role and developed a foreign policy oriented toward humanitarian and peacekeeping causes. To that end, Iceland provided aid and expertise to various NATO-led interventions in Bosnia, Kosovo, and Iraq.