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NEWRY, Northern Ireland—One of the main attractions at the local museum in Newry, a bustling market town some 40 miles south of Belfast, is an old wooden sign. Painted on a chalky white background, its tall red letters proclaim in Irish, then in English: “Custaim: Stad, Customs: Stop.” For decades, this sign stood on the road between Newry, in Northern Ireland, and Dundalk, in the Republic of Ireland, demarking the twisting, 500-kilometer border between the two countries. The sign was taken down when Ireland and the United Kingdom joined the European Union’s single market in 1993. By the time the […]