Your challenge is to have a pan-arab revolt in the Ottoman Empire prior to the summer of 1914, preferably one that succeeds in forming a unified Arab state. The exact borders are flexible, but it should have the majority of Ottoman Arabia, Iraq, and Syria.
With a follow-up: what impact would this have on WW1 and the remaining Ottoman Empire?
With a follow-up: what impact would this have on WW1 and the remaining Ottoman Empire?