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Building a Green Wall

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In the aftermath of Britain’s 2016 decision to leave the EU, the Irish-American ethnic lobby remobilized to defend the Belfast/Good Friday Agreement from the threats posed by Brexit. Drawing on int...
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  • 18 November 2025
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In the aftermath of Britain’s 2016 decision to leave the EU, the Irish-American ethnic lobby remobilized to defend the Belfast/Good Friday Agreement from the threats posed by Brexit.

Drawing on interviews in Washington, Belfast, Dublin and London, Cowell-Meyers and Gallaher explore how the lobby shaped US policy towards Brexit in order to prevent the reimposition of a hard border on the island of Ireland and preserve peace. The authors also consider the lobby’s approach to other contentious issues, including a united Ireland and Troubles-related investigations.

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Price: $127.95
Pages: 298
Publisher: Bristol University Press
Imprint: Bristol University Press
Publication Date: 18 November 2025
ISBN: 9781529237993
Format: Hardcover
BISACs: POLITICAL SCIENCE / International Relations / Diplomacy, Diplomacy, POLITICAL SCIENCE / American Government / General, POLITICAL SCIENCE / World / European, Comparative politics
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‘The authors have pieced together a fascinating account of the manner in which Irish America flexed political muscle in defence of the Good Friday Agreement. As someone who was personally involved, I gained new insight from hearing the views of the various contributors to Irish America’s highly-effective lobbying effort. A compelling and enjoyable read.’ Daniel Mulhall, Former Ambassador of Ireland to the US

‘A masterful account of a pivotal moment when the ‘green wall’ held. The authors surefootedly document the surprising remobilization of Irish America to defend the Good Friday Agreement and limit the damage from Brexit.' Barbara Stephenson, Former Consul General Belfast

‘In the winding, rocky road of the UK’s negotiations to leave the EU, the United States made some critically important interventions. This fascinating book explains how and why these predominantly related to Brexit’s impact on the island of Ireland. More broadly, it testifies to the use of soft power, cultural affinity and personal commitment to effect change abroad – which may, of course, bring risks as well as rewards.'

Katy Hayward, Queens University Belfast

'To assess organized Irish America’s role in stopping the most inane and reckless follies in the Brexiteers’ ‘plans’ for Ireland, there are none better qualified than Professors Kimberly Cowell-Meyers and Carolyn Gallaher. Both scholars have extensive primary research experience in Northern Ireland. And both have decades of scholarly engagement in the diplomatic and party-political pentangle that links Belfast, Dublin, London, Brussels and Washington. The Green Wall is, and will remain, a must-read for those who want to know how Irish Americans helped prevent the resurrection of securitized border functions across the partition line in Ireland, not least by exposing unicorns wrapped in the Union Jack.' Brendan O’Leary, University of Pennsylvania

Kimberly Cowell-Meyers is Associate Professor in the Government Department at American University, Washington, D.C.

Carolyn Gallaher is Professor at the School of International Service at American University, Washington, D.C.

1. Phoenix Rising

2. A Short History of Irish America

3. Irish America as an Ethnic Lobby

4. Brexit and the Problem of Northern Ireland

5. Irish America Remobilises

6. Facing Down the Internal Market Bill

7. Irish America, Joe Biden, and the Path to the Windsor Framework

8. Legacy and the Limits of Irish American Influence

9. The Elephant in the Room: Irish Unity after Brexit

10. Irish America: A Force to be Reckoned with on Brexit

Appendix: Interviews