crs_reports: R46259

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R46259 Northern Ireland: The Peace Process, Ongoing Challenges, and U.S. Interests 2026-03-05T05:00:00Z 2026-03-07T05:53:58Z Active Reports Kristin Archick Europe, Russia & Eurasia Between 1969 and 1999, roughly 3,500 people died as a result of political violence in Northern Ireland, which is one of four component “nations” of the United Kingdom (UK). Often referred to as “the Troubles,” the conflict has its origins in the 1921 division of Ireland. At its core, the conflict has reflected a struggle between the different national, cultural, and religious identities of Northern Ireland’s two dominant communities: unionists, or Protestants who largely define themselves as British and support Northern Ireland’s continued incorporation in the UK, and nationalists, or Catholics who consider themselves Irish and may favor a united Ireland. Successive U.S. Administrations and many Members of Congress have actively supported the Northern Ireland peace process. U.S. development aid provided through the International Fund for Ireland (IFI) has sought to encourage economic development and reconciliation. Congressional hearings have focused on the peace process, human rights, and addressing Northern Ireland’s legacy of violence (often termed dealing with the past). Some Members have expressed interest in how Brexit—the UK’s withdrawal as a member of the European Union (EU) in January 2020—is affecting Northern Ireland. The Peace Agreement: Progress to Date and Ongoing Challenges In 1998, the UK and Irish governments and key Northern Ireland political parties reached a negotiated political settlement. The resulting Good Friday Agreement, or Belfast Agreement, recognized that a change in Northern Ireland’s constitutional status as part of the UK can come about only with the consent of a majority of the people in Northern Ireland (as well as with the consent of a majority in Ireland). The agreement called for devolved government—the transfer of specified powers from London to Belfast—with a Northern Ireland Assembly and Executive in which unionist and nationalist parties would share power. It also contained provisions on decommissioning (disarmament) of paramilitary weapons, policing, human rights, UK security normalization (demilitarization), and the status of prisoners. Despite a much-improved security situation since 1998, implementing the peace agreement proved challenging. In 2007, the pro-British Democratic Unionist Party (DUP) and Sinn Fein, the nationalist political party traditionally associated with the Irish Republican Army (IRA), reached a landmark power-sharing deal. Tensions and distrust persisted, however, and Brexit and other contentious issues have hindered the functioning of Northern Ireland’s government. Assembly elections took place in May 2022, but the DUP blocked the work of the Assembly and prevented the formation of a new Executive to protest the post-Brexit arrangements for Northern Ireland, which the DUP and other unionists viewed as dividing Northern Ireland from the rest of the UK and threatening the UK’s constitutional integrity. In January 2024, the DUP accepted a package of measures proposed by the UK government to address Brexit-related concerns and ended its boycott on Northern Ireland’s power-sharing institutions, paving the way for the devolved government to be reestablished in February 2024. Other issues facing Northern Ireland in its search for peace and reconciliation include reducing sectarian divisions, dealing with the past, addressing lingering concerns about paramilitary and dissident activity, and promoting further economic development. Brexit and Northern Ireland Since 1998, as security checkpoints were dismantled in accordance with the peace agreement and because both the UK and Ireland belonged to the EU single market and customs union, the land border on the island of Ireland effectively disappeared, helping to promote peace and a dynamic cross-border economy. To retain this open border while respecting the rules of the EU single market and customs union, the UK and the EU agreed to post-Brexit trade and customs arrangements for Northern Ireland (initially contained in a Protocol on Ireland/Northern Ireland to the UK’s withdrawal agreement with the EU). Implementation of the post-Brexit arrangements—which began in January 2021—led to some trade disruptions between Northern Ireland and the rest of the UK and exacerbated political and societal tensions in Northern Ireland. The subsequent 2023 Windsor Framework agreed between the UK and the EU and the aforementioned 2024 UK-DUP agreement sought to address DUP concerns about the post-Brexit arrangements and reduce tensions. Brexit also has renewed debate about Northern Ireland’s constitutional status and has prompted calls from Sinn Fein and others for a border poll, or referendum, on whether Northern Ireland should remain part of the UK or join Ireland. https://www.congress.gov/crs_external_products/R/PDF/R46259/R46259.17.pdf https://www.congress.gov/crs_external_products/R/HTML/R46259.html

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