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Politician

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Northern Ireland is 5,456 mi² and is about the size of Tennessee but in square miles it can compare to Connecticut. Connecticut is 5,543 mi².

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When Brexit happens, it will create the U.K.’s first-ever land border with the E.U., on the frontier between the Republic of Ireland and Northern Ireland. This shouldn’t pose passport problems, because the U.K. and Ireland have a longstanding passport-free Common Travel Area agreement. But because Britain is on course to leave the E.U.’s tariff-free single market, imports and exports must somehow be monitored across this 310-mile-long barrier. Controlling this flow by a so-called “hard” border—that is, one with checkpoints and customs controls—would be quite the job. Looking in one direction alone, Northern Irish exports to the Republic are worth £3.6 billion ($4.8 billion) a year, while there are a total of 275 land crossings between the two parts of the island, more than twice the number there are along the E.U.’s entire eastern frontier. A hard border here could thus be a nightmare for both countries.(citylab.com