Re: no palestine - there never was a group that identified themselfs as such until after the creation of israel ... up until then palestine was a geographic description just like levant or appalachia or oceana ....
Perhaps a POD that kept the US from rejecting the league of nations and having wilson being even more forceful in seeking self determination.
For POD, try getting wilsom more assertive for sepf determination and making the US join the league of nations.
Also Fwiw, prior to Israel's reestablishment, Palestinians referred to the Jews with the Arabs (who were offended at being called Palestinian) only adopting the term as a competing-nationalism after the 67 War whereas before they identified themselves as Arabs or South Syrians (part of a Greater Syria) after the 1920 division of Syria between the British and the French.