Northern Ireland's power-sharing Sunningdale Agreement collapses following a general strike by loyalists.

Northern Ireland is a part of the United Kingdom in the north-east of the island of Ireland. It has been variously described as a country, province or region. Northern Ireland shares an open border to the south and west with the Republic of Ireland. At the 2021 census, its population was 1,903,175, making up around 3% of the UK's population and 27% of the population on the island of Ireland. The Northern Ireland Assembly, established by the Northern Ireland Act 1998, holds responsibility for a range of devolved policy matters, while other areas are reserved for the UK Government. The government of Northern Ireland cooperates with the government of Ireland in several areas under the terms of the Good Friday Agreement. The Republic of Ireland also has a consultative role on non-devolved governmental matters through the British–Irish Governmental Conference (BIIG).

The Sunningdale Agreement was an attempt to establish a power-sharing Northern Ireland Executive and a cross-border Council of Ireland. The agreement was signed by the British and Irish government in Sunningdale, Berkshire, on 9 December 1973. Unionist opposition, violence and a general strike caused the collapse of the agreement in May 1974.

The Ulster Workers' Council (UWC) strike was a general strike that took place in Northern Ireland between 15 May and 28 May 1974, during "the Troubles". The strike was called by unionists who were against the Sunningdale Agreement, which had been signed in December 1973. Specifically, the strikers opposed the sharing of political power with Irish nationalists, and the proposed role for the Republic of Ireland's government in running Northern Ireland.

Ulster loyalism is a strand of Ulster unionism associated with working class Ulster Protestants in Northern Ireland. Like other unionists, loyalists support the continued existence of Northern Ireland within the United Kingdom, and oppose a united Ireland independent of the UK. Unlike other strands of unionism, loyalism has been described as an ethnic nationalism of Ulster Protestants and "a variation of British nationalism". Loyalists are often said to have a conditional loyalty to the British state so long as it defends their interests. They see themselves as loyal primarily to the Protestant British monarchy rather than to British governments and institutions, while Garret FitzGerald argued they are loyal to 'Ulster' over 'the Union'. A small minority of loyalists have called for an independent Ulster Protestant state, believing they cannot rely on British governments to support them. The term 'loyalism' is usually associated with paramilitarism.