U.S. Declassified Documents Online provides immediate access to a broad range of previously classified federal records spanning the twentieth and twenty first centuries. The collection brings together the most sensitive documents from all the presidential libraries and numerous executive agencies in a single, easily searchable database.The types of materials include intelligence studies, policy papers, diplomatic correspondence, cabinet meeting minutes, briefing materials, and domestic surveillance and military reports. Materials cover virtually every significant foreign policy development and international crisis, from the years leading up to the First World War through the end of the Cold War. Topics include the outbreak and course of the Second World War, the end of colonialism in the global south, the Korean War, the Vietnam War, U.S. relations with non-aligned states in the 1960s, U.S.-Soviet relations in the era of détente, international trade, nuclear proliferation, conflict in the Middle East, and the War on Terrorism.

This database includes 55 collections of the most important declassified documents regarding critical U.S. policy decisions.