Your knowledge of the region’s history ranges from nonexistent to laughable, and all you know about the Arab Revolt is what you “learned” from the movie Lawrence of Arabia. Let me help you, because what happened then is the key to understanding the situation today.
So, there was no Arab nationalism in the Arab Revolt, but only the then sheriff of Mecca Hussein wanted a little more autonomy for himself in the Ottoman Empire and for his position to be hereditary. This desire of his fit in perfectly with the fact that since the beginning of the First World War in London, they were making plans to overthrow the Ottoman Empire and divide its territory together with the French. All the newly formed states after the end of the First World War, as well as their borders, were the result of a private wartime treaty between Britain and France from 1916, the so-called Sykes–Picot Agreement.
Everything that has happened since the end of World War 1 until today is only the reaction of the people of the region to artificial borders and colonial occupation, where the only difference is that in the meantime the United States appeared and that colonialism wrapped itself in new modern outfit..