The ongoing challenges of peace in Northern Ireland.

US President Joe Biden will visit Belfast, Northern Ireland, next week to mark the 25th anniversary of the Good Friday Agreement (GFA), a peace deal that brought an end to decades of sectarian violence on the island of Ireland known as “the Troubles.” The GFA has largely been successful in reducing violence and creating a power-sharing government in Northern Ireland, but Brexit has complicated relations between Unionist and Republican communities. Biden, who identifies as an Irish American, has repeatedly said that there is no alternative to the GFA and that Brexit must not be allowed to undermine peace.