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. During these tumultuous years of anti-Western nationalism and internal strife, this strategic port nation struggled with its relationship with Israel, the West Bank, and Palestinian refugees-problems that continued to plague Jordan as well as the entire Middle East in succeeding decades. For years, the primary source of instability in Jordan has been the rule of the King Hussein-led Hashemites over the Palestinians, who make up more than half the kingdom's population. The documents in this collection reveal how this tension strained Jordan's relationships with its neighbors, most notably through a series of border incidents and terrorism against Israel and through rioting that prevented Jordan's participation in the Baghdad Pact of 1955. The rise and fall of Sulaiman Nabulsi's National Socialist party is also recorded.