In 2011, the CIA declassified the US Government's six oldest classified documents, dating from 1917 and 1918.
Sources
- Secret Writing: CIA's Oldest Classified Documents - CIA (cia.gov)
- https://www.npr.org/sections/thetwo-way/2011/04/07/135227704/cia-declassifies-its-oldest-documents-secret-ink-formulas (npr.org)
- https://www.washingtonpost.com/blogs/checkpoint-washington/post/cia-declassifies-its-oldest-documents/2011/04/07/AFCLwYtC_blog.html (washingtonpost.com)
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