In the 19th century you had two important events in Europe: the unification of Italy and the unification of Germany, and both of these had a tremendous impact in the Arab world. They saw in this, a model for what they should be able to do, and they tried for a long time to do it. Nasserism is probably the final phase of that movement and, as you know, it failed. Now all the Arab states are independent but no union of Arab states has ever worked. They always fall apart through internal dissension.

Islam and the West: A Conversation with Bernard Lewis (2006)