Foreign Relations of the United States
Compilation of all foreign policy decisions and diplomatic activity. Browse by administration, then geographic area.
For earlier periods (1861-1960), see also the
University of Wisconsin Digital Collections. Available in print at KL, room 154 (S1.1 call number)
American State Papers
Congressional documents for 1789-1838
National Security Archive
Declassified records on issues including U.S. national security, foreign policy, diplomatic and military history, intelligence policy, etc.
Other sources