BEIRUT, Lebanon — The revolutions and revolts in the Arab world, playing out over just a few months across two continents, have proved so inspirational to so many because they offer a new sense of national identity built on the idea of citizenship.

But in the past weeks, the specter of divisions — religion in Egypt, fundamentalism in Tunisia, sect in Syria and Bahrain, clan in Libya — has threatened uprisings that once seemed to promise to resolve questions that have vexed the Arab world since the colonialism era.

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