Northern Ireland has been a major factor in Irish politics since the island of Ireland was divided between Northern Ireland and the twenty-six county southern state in 1920. The creation of Northern Ireland led to conflict between northern nationalists (mostly Catholic) who seek unification with the independent southern state and Unionists (mostly Protestant) who wish for Northern Ireland to remain within the United Kingdom. This conflict exploded into a violent conflict in the late sixties known as the 'Troubles' involving groups such as the Provisional IRA, loyalist paramilitaries, the police and the British army. The Troubles have caused thousands of deaths in Northern Ireland but have also spilled over into bombings and acts of violence on Great Britain and in the Republic of Ireland.
The vast majority of the population of Northern Ireland identifies with one of two different groups, unionists and nationalists. Both sides of the community are often described by their predominant religious attachments. Unionists are predominantly Protestant (the major Protestant faith is Presbyterianism, the second in terms of size is the Church of Ireland), while nationalists are predominantly Catholic. However, contrary to widespread belief, not all Catholics necessarily support nationalism, and not all Protestants necessarily support unionism. It is also important to note that, in parallel with other parts of Europe, the proportion of the population practising their religious beliefs has fallen dramatically in recent decades, particularly among Catholics and adherents of mainstream Protestant denominations. This has not necessarily resulted in a weakening of communal feeling.
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 parliament of the Republic of Ireland is the Oireachtas. The Oireachtas consists of the President and two houses: Dáil Éireann and Seanad Éireann (also known as the Senate). The Dáil is by far the dominant tier of the legislature. The President may not veto laws in most circumstances and the Senate may only delay legislation.
Ulster Scots comprises varieties of the Scots language spoken in Northern Ireland. Many claim it has become a separate language, descended from Scots in Scotland, whereas others question whether Scots is a separate language from English at all, or simply a collection of local dialects of Scottish and Northern Ireland Hiberno-English.
The late nineteenth and early twentieth centuries saw a vigorous but unsuccessful campaign for Irish home rule, followed by the eclipse of moderate nationalism by militant separatism. In 1922, following the Anglo-Irish War, the twenty-six counties of Ireland seceded from the United Kingdom as the Irish Free State. The remaining six, in the north-east, remained within the Union as Northern Ireland. Secession for southern Ireland led directly to the Civil War, as militant nationalists split into two factions and turned against one another.
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.