at the time, Thruston Ballard Morton, regarded the African-American vote as the single most crucial factor. The issue that dominated the election was the rising Cold War tensions between the United States and the Soviet Union. In 1957, the Soviets had launched Sputnik, the first man-made satellite to orbit Earth. Soon afterwards, some American leaders warned that the nation was falling behind communist countries in science and technology. In Cuba, the revolutionary regime of Fidel Castro became a close ally of the Soviet Union in 1960, heightening fears of communist subversion in the Western Hemisphere. Public opinion polls revealed that more than half the American people thought that war with the Soviet Union was inevitable. Kennedy took advantage of increased Cold War tension by emphasizing a perceived "missile gap" between the United States and Soviet Union. He argued that under the Republicans, the Soviets had developed a major advantage in the numbers of nuclear missiles. He proposed a bi-partisan congressional investigation about the possibility that the Soviet Union was ahead of the United States in developing missiles. He also noted in an October 18 speech that several senior US military officers had long criticized the Eisenhower Administration's defense spending policies. Both candidates also argued about the economy and ways in which they could increase the economic growth and prosperity of the 1950s, and make it accessible to more people (especially minorities). Some historians criticize Nixon for not taking greater advantage of Eisenhower's popularity (which was around 60–65% throughout 1960 and on election day), and for not discussing the prosperous economy of the Eisenhower presidency more often in his campaign. As the campaign moved into the final two weeks, the polls and most political pundits predicted a Kennedy victory. However, President Eisenhower, who had largely sat out the campaign, made a vigorous campaign tour for Nixon over the last 10 days before the election. Eisenhower's support gave Nixon a badly needed boost. Nixon also criticized Kennedy for stating that Quemoy and Matsu, two small islands off the coast of Communist China that were held by Nationalist Chinese forces based in Taiwan, were outside the treaty of protection the United States had signed with the Nationalist Chinese. Nixon claimed the islands were included in the treaty, and accused Kennedy of showing weakness towards Communist aggression. Aided by the Quemoy and Matsu issue, and by Eisenhower's support, Nixon began to gain momentum, and