With the signing of the Anglo-Iraqi Treaty and the settling of the Mosul Question, Iraqi politics took on a new dynamic. The emerging class of Sunni and Shia landowning tribal sheikhs vied for positions of power with wealthy and prestigious urban-based Sunni families and with Ottoman-trained army officers and bureaucrats. Because Iraq's newly established political institutions were the creation of a foreign power, and because the concept of democratic government had no precedent in Iraqi history, the politicians in Baghdad lacked legitimacy and never developed deeply rooted constituencies. Thus, despite a constitution and an elected assembly, Iraqi politics was more a shifting alliance of important personalities and cliques than a democracy in the Western sense. The absence of broadly based political institutions inhibited the early nationalist movement's ability to make deep inroads into Iraq's diverse social structure.