Generate text that refutes this claim: Self-determination can destabilise nation states, sometimes with very destructive consequences.  If we accept self-determination as such an important principle that it trumps all others, this will encourage people to self-identify along nationalistic, racial or religious lines, at a time in human development when we are moving away from racist and nationalist ideologies. Nationalism is about difference, which flies in the face of the idea of the global citizen. Taken to its extremes, it encourages increased conflict, separatist terrorism. For example, the ethnic conflicts that led to the breakup of Yugoslavia in the 1990s were fuelled by nationalist ideologies and the stressing of the differences between ethnic and religious groups that made up that country.
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In many cass, it is not self-determination that causes tensions, but the lack of opportunity for minorities to choose their own future. Conflicts and civil wars generally take place not because people want self-determination but because they are not allowed it. In the Yugoslav example, if the Milosevic government had recognised the right of the country's component ethnic groups to self-determination, rather than seeking forcibly to suppress it, then there would have been no armed conflict. In contrast, by the time Montenegro sought to secede from Serbia, the now-democratic Serb government accepted their right to do so, and the split was carried out without bloodshed1.  1 "Montenegro declares independence", BBC News, 4 June 2006.