Another contributing factor to the development of Political Psychology was the introduction of psychometrics and "The Measurement of Attitude" by Thurstone and Chave (1929). The methodological revolution in social science gave quantitative grounds and therefore more credibility to Political Psychology. Research into political preference during campaigns was spurred by George Gallup (1901–1984), who founded the "American Institute of Public Opinion". The 1940s election in America drew a lot of attention in connection with the start of World War II. Gallup, Roper and Crossley instigated research into the chances of Roosevelt being re-elected. Lazarsfeld, Berelson and Gaudet (1944) also conducted a famous panel study "The People's Choice" on the 1940s election campaign. These studies drew attention to the possibility of measuring political techniques using psychological theories. The entry of the US into World War II spiraled vast research into fields such as war technique, propaganda, group moral, psycho-biography and culture conflict to name a few, with the U.S. army and Navy recruiting young psychologists. Thus the discipline quickly developed and gained international accreditation.