After the settlement in the south, Nimeiri attempted to mend fences with northern Muslim religious groups. The government undertook administrative decentralization, popular with the Ansar, that favored rural over urban areas, where leftist activism was most evident. Khartoum also reaffirmed Islam's special position in the country, recognized the sharia as the source of all legislation, and released some members of religious orders who had been incarcerated. However, a reconciliation with conservative groups, which had organized outside Sudan under Sadiq al Mahdi's leadership and were later known as the National Front, eluded Nimeiri.

In August 1972, Nimeiri sought to consolidate his position by creating a Constituent Assembly to draft a permanent constitution. He then asked for the government's resignation to allow him to appoint a cabinet whose members were drawn from the Constituent Assembly. Nimeiri excluded individuals who had opposed the southern settlement or who had been identified with the SSU's pro-Egyptian faction.

In May 1973, the Constitutent Assembly promulgated a draft constitution. This document provided for a continuation of presidential government, recognized the SSU as the only authorized political organization, and supported regional autonomy for the south. The constitution also stipulated that voters were to choose members for the 250-seat People's Assembly from an SSU-approved slate. Although it cited Islam as Sudan's official religion, the constitution admitted Christianity as the faith of a large number of Sudanese citizens (see Christianity , ch. 2). In May 1974, voters selected 125 members for the assembly SSU-affiliated occupational and professional groups named 100 and the president appointed the remaining 25.

Discontent with Nimeiri's policies and the increased military role in government escalated as a result of food shortages and the southern settlement, which many Muslim conservatives regarded as surrender. In 1973 and 1974 there were unsuccessful coup attempts against Nimeiri. Muslims and leftist students also staged strikes against the government. In September 1974, Nimeiri responded to this unrest by declaring a state of emergency, purging the SSU, and arresting large numbers of dissidents. Nimeiri also replaced some cabinet members with military personnel loyal to him.

Conservative opposition to Nimeiri coalesced in the National Front, formed in 1974. The National Front included people from Sadiq's wing of Umma the NUP and the Islamic Charter Front, then the political arm of the Muslim Brotherhood, an Islamic activist movement. Their activity crystallized in a July 1976 Ansar-inspired coup attempt. Government soldiers quickly restored order by killing more than 700 rebels in Khartoum and arresting scores of dissidents, including many prominent religious leaders. Despite this unrest, in 1977 Sudanese voters reelected Nimeiri for a second six-year term as president.

Data as of June 1991