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               Researh Sevice






Northern Ireland, Brexit, and the Irish Border



March 12, 2018
As the 20th anniversary of the April 1998 peace accord for Northern Ireland (known as the Good Friday
Agreement or the Belfast Agreement) approaches, concerns are increasing about how the expected exit of
the United Kingdom (UK) from the European Union (EU)-or Brexit-might affect Northern Ireland.
The future of the border between Northern Ireland and the Republic of Ireland has become a central issue
in the UK's withdrawal negotiations with the EU. Once the UK ceases to be a member of the EU-likely
in March 2019-Northern Ireland will be the only part of the UK to share a land border with an EU
member state (Ireland and the UK both joined the EU in 1973). Agreeing upon arrangements for the post-
Brexit UK-Irish border is particularly challenging because of Northern Ireland's history of political
violence. Roughly 3,500 people died during the Troubles, the 30-year sectarian conflict between
unionists (Protestants who largely define themselves as British and support remaining part of the UK) and
nationalists (Catholics who consider themselves Irish and may desire a united Ireland).
UK, Irish, and EU leaders have pledged repeatedly that they will seek to avoid a hard border (with
customs and security checks) on the island of Ireland to help preserve the peace process and extensive
cross-border economic ties. Many in Ireland and the EU, however, question whether and how this will be
possible if the UK continues to pursue a hard Brexit outside of the EU's single market and customs
union. (See also CRS Report RS21333, Northern Ireland: Current Issues and Ongoing Challenges in the
Peace Process, and CRS Report RL33105, The United Kingdom: Background, Brexit, and Relations with
the United States.)

Peace, the EU, and the Border
In 1998, the EU membership of both the UK and the Republic of Ireland was viewed as underpinning the
Northern Ireland peace process by providing a common European identity for unionists and nationalists.
In the years since, as security checkpoints were removed in accordance with the peace agreement and
because both the UK and Ireland belonged to the EU's single market and customs union, the circuitous
300-mile land border between Northern Ireland and Ireland effectively disappeared. This served as an
important symbol on both sides of the sectarian divide and helped to produce a dynamic cross-border
economy.
Brexit has raised significant political and economic concerns in Northern Ireland (which, unlike the UK
overall, voted to remain in the EU). Many experts deem an invisible border as crucial to a still-fragile
peace process, in which deep divisions and a lack of trust persist. This situation is evidenced perhaps most
                                                                 Congressional Research Service
                                                                   https://crsreports.congress.gov
                                                                                       IN10869

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