U.S. Department of State - Center of Excellence Collection at UVA Library

Declassified State Dept. Materials

Department of State Virtual Reading Room
Almost 100,000 declassified documents are searchable here.
National Security Archive
From George Washington University. A publicly available archive which includes State Dept. documents. "Founded in 1985 by journalists and scholars to check rising government secrecy, the National Security Archive combines a unique range of functions: investigative journalism center, research institute on international affairs, library and archive of declassified U.S. documents ...".

U.S. Declassified Documents Online
Searchable collection of over 70,000 scanned declassified U.S. documents from the 1940s onwards taken from presidential libraries, the CIA, the FBI and other agencies. Covers the Cold War, Vietnam, the civil rights movement and other events.