In 2011, the American equivalent to the DDS, the official documentary historical record of major U.S. foreign policy decisions, called «Foreign Relations of the United States» (FRUS), celebrates its 150th anniversary. The series of the FRUS is produced by the State Department's Office of the Historian and is thus a governmental research institute. The project is based on a law that calls for a «thorough, accurate, and reliable» documentary record of United States foreign policy.