The starting point for explaining modern Palestinian political history is the assumption that Palestinians failed to organize adequately during the British Mandate (1918–1948), were defeated by the Zionist movement, and consequently dispersed from their homeland. That Palestinians did not unite politically during this crucial period in their history, nor cooperate economically, nor even band together militarily is considered corollaries of this organizational incapacity and reasons enough for their failure to achieve a national sovereignty of their own. Thus Porath notes that ultimately no Palestinian political organization could bridge the divisions of region, family, and narrow economic or political interest which encouraged the proliferation of parties and weakened the drive against Zionism. Ann Mosely Lesch calls her book on Arab politics in Palestine, “the frustration of a nationalist movement.”