In this Monday, Jan. 30, 2017 file photo, a motorist crosses over the border from the Irish Republic into Northern Ireland near the town of Jonesborough, Northern Ireland. After Britain leaves the European Union in 2019, the 310-mile (500-kilometre) border between Northern Ireland and Ireland will be the U.K.'s only land frontier with a member of the bloc. That makes it one of the trickiest issues in the divorce negotiations - and the most sensitive, given Northern Ireland's history of violence and conflicting identities in a region where some consider themselves British and others Irish.
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In this Monday, Jan. 30, 2017 file photo, a motorist crosses over the border from the Irish Republic into Northern Ireland near the town of Jonesborough, Northern Ireland. After Britain leaves the European Union in 2019, the 310-mile (500-kilometre) border between Northern Ireland and Ireland will be the U.K.'s only land frontier with a member of the bloc. That makes it one of the trickiest issues in the divorce negotiations - and the most sensitive, given Northern Ireland's history of violence and conflicting identities in a region where some consider themselves British and others Irish. (Peter Morrison/Associated Press)
