Aswan Dam assumption did not take into account the extent of perennial irrigation that was already present throughout Egypt decades before the high dam closure. By the 1950s only a small proportion of Upper Egypt had not been converted from basin (low transmission) to perennial (high transmission) irrigation. Expansion of perennial irrigation systems in Egypt did not depend on the high dam. In fact, within 15 years of the high dam closure there was solid evidence that biharzia was declining in Upper Egypt. S. haematobium has since disappeared altogether. Suggested reasons for this include improvements in irrigation practice. In the Nile Delta,
United States foreign policy in the Middle East in the country. The involvement that the U.S. would take in Egyptian business and politics in return for aid, Nasser thought "smacked of colonialism." Indeed, as political scholar B.M. Bleckman argued in 1978, "Nasser had ambivalent feelings toward the United States. From 1952 to 1954 he was on close terms with U.S. officials and was viewed in Washington as a promising moderate Arab leader. The conclusion of an arms deal with the USSR in 1955, however, had cooled the relationship between Cairo and Washington considerably, and the Dulles-Eisenhower decision to withdraw the offer to finance the Aswan High Dam in