[1/3] Prime Minister Tony Blair (R) embraces Irish Prime Minister Bertie Ahern after all parties reached a historic peace agreement April 10, 1998. The peace has utterly transformed the region, largely ending three decades of bitter violence that killed 3,600. "Nothing's ever irresolvable" said Blair, summing up the stubborn optimism many developed working in Northern Ireland at the turn of the millennium. Nationalists, who are mostly Catholic, say Northern Ireland was wrenched from the EU in a UK-wide vote even though its smallest region voted 56% to 44% to remain. "There is an exhaustion and frustration," at the DUP's repeated objections, said Ahern, Irish prime minister from 1997-2008.

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