The Ugly American and the Soviets struggled for preeminence in the Third World through proxies in Latin America, Africa, and Asia. In the Middle East, the US feared the spread of Communism starting in Egypt and attempted to secure the region's most populous and politically powerful country for the West by guarantees of funding for construction of the Aswan Dam but it was eventually the Soviets who prevailed. Soviet diplomatic and political successes in the Third World left the West worried about losing one country after another to Communism according to the domino theory evoked by President Dwight D. Eisenhower. It was in
Hydropower policy in the United States of 90% efficiency. More importantly, Francis's mathematical and graphical calculation methods advanced turbine design and engineering and allowed confident design of high efficiency turbines to exactly match a site's flow conditions. In the 1870s and deriving from uses in the mining industry, the high efficiency Pelton wheel impulse turbine was developed to use hydropower under very different flow and pressure conditions. Advances in dam design also progressed, with the completion of Old Aswan Dam being considered a milestone of engineering over nature. At the time of its construction, nothing of such scale had ever been attempted: it also became one