When Britain narrowly voted to leave the European Union in 2016, it opened a can of worms, the biggest of which was the Irish border. The United Kingdom shares a 310-mile land border with the Republic of Ireland. It cuts through towns and pastures and stretches from the cultural capital of Derry to the small city of Newry. As it stands right now, the Irish border is open. People cross it daily. Commerce flows from the North to the South unhindered. But when the UK leaves the EU in March 2019, this will likely change due to regulatory and customs…

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