The declassified records that comprise this collection provide a detailed account of the diplomatic, economic, military, and cultural relationship between the United States and Cuba in the era of Fidel Castro (1926–2016). Included are extensive official records gathered from presidential libraries, government archives, the Central Intelligence Agency (CIA), the Federal Bureau of Investigation (FBI), and the Department of State (DOS). The collection was originally built by historian Thomas G. Paterson (b. 1941) during his more than 25 years of research and writing on U.S.-Cuba relations in the Cold War period.