Department of State Research Topics
Department of State
Central Files (RG 59)
For most research topics, the central files are the largest and most important category of Department of State records. The files include Department of State communications with U.S. diplomatic and consular offices in foreign countries and with foreign diplomatic and consular offices in the United States, and correspondence with other U.S. Government agencies and the public. The central files also include internal memorandums and reports. Despite the increase of decentralized files in the period after World War II, the so-called "Lot Files," research in almost all topics relating to U.S. foreign policy and foreign affairs should begin with the central files of the Department of State.
Record keeping in the Department of State changed over the years. As a result, how you use the records will depend on the dates of the subject of your research. There are records from five major periods of record keeping: