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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.

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.

Nationalist grievances at Unionist discrimination within the state eventually led to large civil rights protests in 1960s. It was during this period of civil unrest that the Provisional IRA, an extra-legal paramilitary group favouring the creation of a united Ireland, began its campaign of bombings and shootings. Other groups on both the Unionist and nationalist side also began to participate in the violence and the period known as the "Troubles" began. Owing to the civil unrest the British government suspended home rule in 1972 and imposed direct rule.

Prior to the Government of Ireland Act 1920 the island had existed for centuries as one unified political entity, either on its own (as the Lordship of Ireland, the Kingdom of Ireland) or as part of the United Kingdom of Great Britain and Ireland. Prior to English rule in mediæval times the island was made up of a patchwork of small kingdoms that were people and clan rather than territory-based. At the top of this system was the Ard Ri or High King of Ireland. See Irish States (1171-present).

A majority of the present-day population are unionist and wish to remain part of the United Kingdom, but a significant minority, known as nationalists, want to see a united Ireland. These two views are linked to deeper cultural divisions. Unionists are predominantly Protestant and often descendants of Scottish and English (mainly Scottish) settlement in previous centuries, while nationalists are predominantly Catholic and usually descend from the Irish population predating such settlement. The conflict between these two sets of identities, including alleged discrimination against nationalists under the Stormont government (1920–72) giving rise to the nationalist "Civil Rights Movement" in the 1960s, and eventually to a long-running conflict known as The Troubles.

The potato would appear to have been introduced into Ireland in the second half of the 17th century, initially as a garden crop. It eventually came to be the main food field crop of the tenant and labouring classes. As a food source, the potato is extremely efficient in terms of energy yielded per unit area of land. The potato is also a good source of many vitamins and minerals, particularly vitamin C (especially when fresh).

The dialect of English spoken in Northern Ireland shows heavy influence by that of Scotland, thereby giving it a distinct accent compared to other forms of Hiberno-English, along with the use of such Scots words as wee for 'little' and aye for 'yes'. Some jocularly call this version of Hiberno-English phonetically by the name Norn Iron. There are supposedly some minute differences in pronunciation between Protestants and Catholics, the best known of which is the name of the letter h, which Protestants tend to pronounce as "aitch", as in British English, and Catholics tend to pronounce as "haitch", as in Hiberno-English. However, geography is a much more important determinant of dialect than ethnic background. English is by far the most widely spoken language in Northern Ireland.

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.

The head of state is the President of Ireland. In keeping with the state's parliamentary system of government the President exercises largely a ceremonial role but does possess certain reserve powers. The presidency is open to all citizens who are at least 35. They are directly elected by secret ballot under the Alternative Vote. A candidate may also be chosen by a consensus among the political parties, in which case it is unnecessary to proceed to a ballot. The President is elected to a seven year term; no candidate may serve more than two terms. In carrying out certain of her constitutional functions, the President is aided by the Council of State.