Historians studying archival photographs from four decades ago have come to the conclusion that the U.S. must have believed in science at some point. According to the historian Davis Logsdon, who has been sifting through mounds of photographic evidence at the University of Minnesota, the nation apparently once held the view that investing in science and even math could yield accomplishments that would be a source of national pride. While Logsdon has not developed a complete theory to explain the United States pro-science stance during that era, he attributes some of it to the liberal views of the President at that time, Richard M. Nixon. 