On January 3, 1919, Chaim Weizmann, head of the British Zionist Federation, and the Emir Faisal ibn Hussein, head of the Arab delegation to the Versailles peace conference, signed an agreement of cooperation between their two peoples. In it, Faisal, representing the Arab nation as a whole, accepted the terms of the 1917 Balfour Declaration, in which the British government committed itself to “establishment...