Ireland (// or //; Irish: Éire, pronounced [ˈeːɾʲə] ( listen)), also known as the Republic of Ireland (Irish: Poblacht na hÉireann), is a sovereign state in Europe occupying about five-sixths of the island of Ireland. It is a unitary parliamentary republic with an elected president serving as head of state. The head of government—called the Taoiseach—is nominated by the lower house of parliament (Dáil Éireann). The capital is Dublin in the east of the island. The state shares its only land border with Northern Ireland, one of the constituent countries of the United Kingdom. It is otherwise surrounded by the Atlantic Ocean, with the Celtic Sea to the south, Saint George's Channel to the south east, and the Irish Sea to the east.
The modern Irish state gained independence from the United Kingdom in 1922 following a war of independence resulting in the Anglo-Irish Treaty, with Northern Ireland exercising an option to remain in the United Kingdom. Initially a dominion within the British Empire called the Irish Free State, a new constitution and the name of "Ireland" were adopted in 1937. In 1949 the remaining duties of the King were removed and Ireland was declared a republic, with the description Republic of Ireland. The state had no formal relations with Northern Ireland for most of the twentieth century, but since 1999 they have co-operated on a number of policy areas under the North-South Ministerial Council created under the Good Friday Agreement.
Whilst Ireland today ranks amongst the wealthiest countries in the world in terms of GDP per capita, the country was once one of the poorest in Western Europe. Economic protectionism was dismantled in the late 1950s and Ireland joined the European Economic Community in 1973. Economic liberalism from the late 1980s onwards resulted in rapid economic expansion, particularly from 1995 to 2007, which became known as the Celtic Tiger period. An unprecedented financial crisis beginning in 2008 ended this era of rapid economic growth.
In 2011 and 2013, Ireland was ranked the seventh most developed nation in the world by the United Nations' Human Development Index, Ireland is also highly ranked for press, economic and political freedom. Ireland is a member of the European Union and is a founding member of the Council of Europe and the OECD. It pursues a policy of neutrality through non-alignment and consequently is not a member of NATO, although it does participate in Partnership for Peace.
The Constitution of Ireland provides that "[t]he name of the State is Éire, or, in the English language, Ireland". Under Irish statute law, Republic of Ireland (or Poblacht na hÉireann in Irish) is "the description of the State" but is not its official name. This official description was provided for in the Republic of Ireland Act 1948, which transferred the remaining duties of monarch to an elected president. However, the name of the state in English remained Ireland. A change to the name of the state would require a constitutional amendment. In the UK however, the Ireland Act 1949 provided that Republic of Ireland may be used as a name for the Irish state (although it did not make use of that term mandatory).