forces. In 1958, following a period of economic difficulties and political manoeuvring that paralysed public administration, Chief of Staff Major General Ibrahim Abboud overthrew the parliamentary regime in a bloodless coup d'état. Gen. Abboud did not carry out his promises to return Sudan to civilian government, however, and popular resentment against army rule led to a wave of riots and strikes in late October 1964 that forced the military to relinquish power. 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. The Nimeiry Era Dissatisfaction culminated in a second coup d'état on May 25, 1969. The coup leader, Col. Gaafar Nimeiry, became prime minister, and the new regime abolished parliament and outlawed all political parties. Disputes between Marxist and non-Marxist elements within the ruling military coalition resulted in a briefly successful coup in July 1971, led by the Sudanese Communist Party. Several days later, anti-communist military elements restored Nimeiry to power. In 1972, the Addis Ababa Agreement led to a cessation of the north–south civil war and a degree of self-rule. This led to ten years hiatus in the civil war. Until the early 1970s, Sudan's agricultural output was mostly dedicated to internal consumption. In 1972, the Sudanese government became more pro-Western, and made plans to export food and cash crops. However, commodity prices declined throughout the 1970s causing economic problems for Sudan. At the same time, debt servicing costs, from the money spent mechanizing agriculture, rose. In 1978, the International Monetary Fund (IMF) negotiated a Structural Adjustment Program with the government. This further promoted the mechanized export agriculture sector. This caused great economic problems for the pastoralists of Sudan (See Nuba Peoples). In 1976, the Ansars mounted a bloody but unsuccessful coup attempt. In July 1977, President Nimeiry met with Ansar leader Sadiq al-Mahdi, opening the way for reconciliation. Hundreds of political prisoners were released, and in August a general amnesty was