plans to expand the country's education, economic, and transportation sectors. To achieve these goals, Khartoum needed foreign economic and technical assistance, to which the United States made an early commitment. Conversations between the two governments had begun in mid-1957, and the parliament ratified a United States aid agreement in July 1958. Washington hoped this agreement would reduce Sudan's excessive reliance on a one-crop (cotton) economy and would facilitate the development of the country's transportation and communications infrastructure. The prime minister formed a coalition government in February 1956, but he alienated the Khatmiyyah by supporting increasingly secular government policies. In June some Khatmiyyah members who had defected from the NUP established the People's Democratic Party (PDP) under Ahmed al-Mirghani's leadership. The Umma and the PDP combined in parliament to bring down the Azhari government. With support from the two parties and backing from the Ansar and the Khatmiyyah, Abdallah Khalil put together a coalition government. Major issues confronting Khalil's coalition government included winning agreement on a permanent constitution, stabilizing the south, encouraging economic development, and improving relations with Egypt. Strains within the Umma-PDP coalition hampered the government's ability to make progress on these matters. The Umma, for example, wanted the proposed constitution to institute a presidential form of government on the assumption that Abd al-Rahman al-Mahdi would be elected the first president. The consensus was lacking about the country's economic future. A poor cotton harvest followed the 1957 bumper cotton crop, which Sudan had been unable to sell at a good price in a glutted market. This downturn depleted Sudan's reserves and caused unrest over government-imposed economic restrictions. To overcome these problems and finance future development projects, the Umma called for greater reliance on foreign aid. The PDP, however, objected to this strategy because it promoted unacceptable foreign influence in Sudan. The PDP's philosophy reflected the Arab nationalism espoused by Gamal Abdul Nasser, who had replaced Egyptian leader Naguib in 1954. Despite these policy differences, the Umma-PDP coalition lasted for the remaining year of the parliament's tenure. Moreover, after the parliament adjourned, the two parties promised to maintain a common front for the 1958 elections. The electorate gave a plurality in both houses to the Umma and an overall majority to the Umma-PDP coalition. The NUP, however, won nearly one-quarter of the seats, largely from urban centers and from Gezira Scheme agricultural workers. In the south, the vote represented a rejection