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The Irish tradition of folk music and dance is also widely known. In the middle years of the 20th century, as Irish society was attempting to modernise, traditional music fell out of favour to some extent, especially in urban areas. Young people at this time tended to look to Britain and, particularly, the United States as models of progress and jazz and rock and roll became extremely popular. During the 1960s, and inspired by the American folk music movement, there was a revival of interest in the Irish tradition. This revival was inspired by groups like The Dubliners, the Clancy Brothers and Sweeney's Men and individuals like Sean Ó Riada.

The Republic of Ireland is a sovereign, independent state. It is a representative democracy under a parliamentary system of government, with a president, prime minister and parliament. The capital city is Dublin. While there are a number of important political parties in the state, the two largest are Fianna Fáil and Fine Gael. The state is a member of the European Union.

The Republic of Ireland is a common law jurisdiction. The judiciary consists of the Supreme Court, the High Court and many lower courts established by law. Judges are appointed by the President after being nominated by the Government and can be removed from office only for misbehaviour or incapacity, and then only by resolution of both houses of the Oireachtas. The final court of appeal is the Supreme Court, which consists of the Chief Justice and seven other justices. The Supreme Court has the power of judicial review and may declare to be invalid both laws and acts of the state which are repugnant to the constitution.

Northern Ireland currently has 18 seats in the United Kingdom House of Commons. The Northern Ireland Assembly has 108 MLAs, although this is currently in suspension. It is also represented in the European Parliament with 3 seats, and at local level by 26 district councils.

Northern Ireland was covered by an ice sheet for most of the last ice age and on numerous previous occasions, the legacy of which can be seen in the extensive coverage of drumlins in Counties Fermanagh, Armagh, Antrim and particularly Down. The centrepiece of Northern Ireland's geography is Lough Neagh, at 392 km² the largest freshwater lake in the British Isles. A second extensive lake system is centred on Lower and Upper Lough Erne in Fermanagh.

As archaeological evidence from sites such as the Céide Fields in County Mayo and Lough Gur in County Limerick demonstrates, farming in Ireland is an activity that goes back to the very beginnings of human settlement. In historic times, texts such as the Táin Bó Cúailinge show a society in which cattle represented a primary source of wealth and status. Little of this had changed by the time of the Norman conquest of Ireland in the 12th century. Giraldus Cambrensis portrays a Gaelic society in which cattle farming and transhumance is the norm. Three hundred years later, the society depicted in Edmund Spenser's A View of the Present State of Ireland had changed remarkably little. Even today, when a quarter of the population of the Republic lives in Dublin, the cattle population is of the order of 6.7 million. The total population of humans on the island, north and south, only just approaches this figure.

In recent decades the Catholic population has increased in percentage terms within Northern Ireland, while the Presbyterian and Church of Ireland population percentages have decreased. However the decreasing size of Catholic families and the increasing use of birth control among the Catholic community and led to a slowing down in the growth of the Catholic population. Statisticians predict both communities will achieve close to parity in size, with Protestants dominant primarily to the east of Northern Ireland and Catholics dominant to the west and south. However as of 2005 most statisticians predict that Protestants will continue to slightly outnumber Catholics in Northern Ireland as a whole. As not all Catholics are nationalists, they predict a continuing majority in favour of the union with the United Kingdom. However this is disputed by a minority of statisticians.

Most Northern Irish Catholics support unification, although opinion polls have shown a minority who support remaining part of the UK, usually while continuing to support nationalist political parties. This proportion has slowly but steadily declined over the course of the Troubles. The proportion of Protestants who wish to join the Republic is smaller. There are also considerable numbers of people who give ambiguous answers to questions about the future constitutional status of Northern Ireland.

A significant recent change to pub culture in Ireland has been the introduction of a smoking ban, in all workplaces, which includes pubs and restaurants. The ban was introduced on 29 March 2004. A majority of the population support the ban, including a significant percentage of smokers. Nevertheless, the atmosphere in pubs has changed greatly as a result, regardless of whether it has boosted or lowered sales, or whether it is a "good thing" or a "bad thing".

In 1800 the Irish Parliament passed the Act of Union which, in 1801, merged the Kingdom of Ireland and the Kingdom of Great Britain to create the United Kingdom of Great Britain and Ireland. The whole island of Ireland would remain within the United Kingdom, rule directly by the UK Parliament in London. The nineteenth century saw considerable economic difficulties for Ireland, including the Great Famine of the 1840s in which about 750,000 people died and another million were forced to emigrate.

The island is often referred to as being part of the British Isles. However, some people, especially in Ireland, take exception to this name, which seems to suggest that both islands belong to Britain. For this reason, "Britain and Ireland" is commonly used as a more neutral alternative. Another suggestion, although much less used, is the Islands of the North Atlantic (IONA).

In 1998, following a Provisional IRA cease-fire, the Good Friday Agreement was concluded and attempts began to be made to restore self-government to Northern Ireland on the basis of power sharing between the two communities. Violence has greatly decreased since the signing of the accord.

The whole of Northern Ireland has a temperate maritime climate, rather wetter in the west than the east although cloud cover is persistent across the region. The weather is unpredictable at all times of the year, and although the seasons are distinct they are considerably less pronounced than in interior Europe or the eastern seaboard on North America. Average daytime maximums in Belfast are 6.5°C in January and 17.5°C in July. The damp climate and extensive deforestation in the 16th and 17th Centuries results in much of the region being covered in rich green grassland.