The U.S. State Department Central Files are the definitive source of American diplomatic reporting on political, military, social, and economic developments throughout the world in the 20th century. Concentrating exclusively on those Central Files that have not been microfilmed by the National Archives or other publishers, UPA's microfilm editions of the Central Files nonetheless dwarf the State Department's very selective volumes of the Foreign Relations of the United States (FRUS). Containing less than one percent of the material in the Central Files, FRUS focuses on U.S. relations with individual countries but does not include coverage of many of the key topics to which the majority of the original files are devoted. Each part of the Central Files contains a wide range of materials from U.S. diplomats in foreign countries: special reports on political and military affairs; studies and statistics on socioeconomic matters; interviews and minutes of meetings with foreign government officials; court proceedings and other legal documents; full texts of important letters, instructions, and cables sent and received by U.S. diplomatic personnel; voluminous reports and translations from foreign journals and newspapers; and countless translations of high-level foreign government documents. On-the-spot reports shed new light on the Panamanian Revolution of 1931, and on how the new leadership dealt with old problems. Analyses of the 1948 elections-which produced four presidents in less than two years due to recounts and untimely deaths-are also included. This comprehensive file examines all political figures of note, including Amulfo Arias, wartime president and American ally Ricardo de la Guardia, the liberal Domingo Diaz, and the power-brokering police commandant Jos6 Rem6n.