Abstract: The subject of this article is the content of the foreign electronic archival documents of U.S. departments dedicated to the analysis of situation in the Soviet Union. The goal consists in carrying out a historiographical analysis of foreign documentary heritage of the United States within the framework of comprehension of historical experience of the development of the Soviet Union in the 1970s – 1989. The object this research is the published materials of the Central Intelligence Agency and the Historical Sector of the U.S. Department of State, which contain records on the analysis of development of the Soviet Union during this period. Relevance of this topic is substantiated by increased of the publically available foreign electronic archival materials, which requires their analysis, description, determination of information capacity, as well as assessment of information contained therein for further utilization in the historical (humanities) research on the contemporary history of Russia. The novelty is defined by the fact that this article is first based on interpretation of foreign historical sources to describe the capabilities and limitations of different types of published intelligence documents of the CIA and the U.S. Department of State that characterize the development of the Soviet Union in various spheres. Introduced into the scientific discourse documents allow concluding on the prospects of using the heritage of the U.S. electronic archives in the scientific research, as well as assessing their veracity and reliability. The authors note that these materials contain valuable information on the U.S. policy with regards to the USSR, and analytical awareness on socioeconomic development of the Soviet Union during the 1970s – 1980s. It is established that in many cases publication of the foreign archival documents is often of tendentious nature.