When Somaliland’s people vote at the end of September, they will not be deciding explicitly on secession, but their steady effort at state building does amplify their claims to independence. So, two years after Kosovo’s independence, and a year after Russian troops wrenched Abkhazia and South Ossetia from Georgia, it is high time for diplomats and statesmen to provide some guidelines as to when and in what circumstances secession is likely to be acceptable.