The Abboud regime was followed by a provisional government until parliamentary elections in April 1965 led to a coalition government of the Umma and National Unionist Parties under Prime Minister Muhammad Ahmad Mahjoub. Between 1966 and 1969, Sudan had a series of governments that proved unable either to agree on a permanent constitution or to cope with problems of factionalism, economic stagnation, and ethnic dissidence. The succession of early post-independence governments were dominated by Arab Muslims who viewed Sudan as a Muslim Arab state. Indeed, the Umma/NUP proposed 1968 constitution was arguably Sudan's first Islamic-oriented constitution.