The Palestinian Mandate also included the territory which became Jordan, so if you're going to use that argument, Palestinians also had a large country they could go to at their disposal. Not a state argument: The idea of sovereignty over an area is not only a Western concept - There have been great empires in Asia and the Middle East exercising sovereignty over areas for thousand of year. In fact there was one exercising sovereignty over Palestine. It was called the Ottoman Empire. The Ottoman Empire lost it's territory in Palestine, which then included TransJordan to the Brits by right of Conquest (which happens to have been legal). The Brits promised to the Jews to create national homeland there (Balfour) and also promised the same to the Arabs, who were not the previous sovereigns. The Churchhill White paper clarified that they specifically excluded the area west of the Jordan from the promise to the Arabs, and in practice, they forbade Jews to enter the territory east of the Jordan. Which is to say they kept their promise to create an Arab state by creating on in TransJordan.
Magnitude 6.1 quake hits Panama-Colombia border (Reuters)