> on July 26, CIA was officially born. Just a few months later, on October 1, CIA assumed all responsibility for the JANIS basic intelligence program. Shortly thereafter, JANIS was renamed the National Intelligence Survey (NIS), but continued along the same tradition, providing policymakers and military leaders with up-to-date data, maps, and other reference materials.

> In 1971, the Factbook was created as an annual summary of the NIS studies and in 1973 it supplanted the NIS encyclopedic studies as CIA’s publication of basic intelligence. It was first made available to the public in 1975 and in 1981 was renamed The World Factbook.

https://www.cia.gov/stories/story/history-of-the-world-factb...