AS TH E EU ROPEAN project grew from six reasonably cohesive members to 28 more diverse and Less controllable ones, it was faced with two big questions. One was what to do if a country decided to leave. The response of the United States to South Carolina's secession in 1860 seemed excessive, so instead the treaty was amended to include Article 50, which sets out the procedure for exit. The hope was that it would never be used, but now Britain is invoking it. Untried though the procedure is, one thing seems certain: it will be long-drawn-out and painfulfor everyone.
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