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. The State Department Central Files on the internal affairs and foreign affairs of Palestine-Israel from 1945 through 1954 cover events that were to shape the future of the entire Middle East: largescale Jewish immigration to Palestine, special Anglo-American and United Nations commissions that tried to resolve the conflicting claims of Arabs and Jews, Britain's withdrawal of its unworkable mandate in Palestine, the proclamation of the state of Israel, the Arab-Israeli war of 1948, territorial gains by victorious Israeli forces, recognition of the state of Israel by the U.S. and other nations, and admission of Israel to the United Nations. Moreover, this period was marked by vigorous debates within Israel on the policies and direction of the new nation, by the establishment of strong ties between the United States and Israel, by border clashes and a worsening of tensions between Israel and its Arab neighbors, and by a considerable increase in the number of Palestinian refugees and in their militancy.