In 1921, the British split Palestine and Jordan along the Jordan River, a boundary that meant nothing to those living in the area.
This website claims that the reasoning was “The result was that Abdullah, an Arab from the Hejaz (now Saudi Arabia), was abruptly installed as the Emir of Transjordan by the British. In a British memorandum presented to the League of Nations on 16 September 1922, it was declared that the provisions of the Mandate document calling for the establishment of a Jewish national home were not applicable to the territory known as Transjordan (today called Jordan),thereby severing almost 80% of the Mandate land from any possible Jewish Homeland.”
However, this author claims that it was the Jews, not the Arabs, who suffered greatly from post-WWI colonial powers. He regards the Balfour Declaration and the Cairo Conference as contradictory documents since Jordan was initially part of Palestine, although he does not exactly specify a date since Palestine was never a political unit under the Ottoman territory. He also claims that 77 percent of Palestine was given to the Arabs, through Jordan.
