What were the main obstacles of Arab Unity?

What were the main" rel="nofollow">in obstacles of Arab Unity? "What were the main" rel="nofollow">in obstacles of Arab Unity?" Clear effective written skills. Evidence of analytical understandin" rel="nofollow">ing, clear argument. Familiarity of relevant literature. Suggested sources: - Pan-Arab Nationalism: The Ideological Dream as Compellin" rel="nofollow">ing Force Barry Rubin" rel="nofollow">in Journal of Contemporary History > Vol. 26, No. 3/4, The Impact of Western Nationalisms: Essays Dedicated to Walter Z. Laqueur on the Occasion of His 70th Birthday (Sep., 1991) - Khalidi Rashid, The Origin" rel="nofollow">ins of Arab nationalism , NY Oxford University press, 1991. - Jankowski, James and Gershoni, Israel (eds.), Rethin" rel="nofollow">inkin" rel="nofollow">ing nationalism in" rel="nofollow">in the Arab Middle East, New York ; Chichester : Columbia University Press, c1997 -Spencer, P. & H. Wollman, eds (2005) Nations and Nationalism: A Reader (Edin" rel="nofollow">inburgh University Press) - Hobsbawm, E. (1991) Nations and Nationalism sin" rel="nofollow">ince 1780 (Cambridge)