On July 1, 1968, the Treaty on the Nonproliferation of Nuclear Weapons was opened for signature in three Depository state capitals: Washington, London, and Moscow. Two years later, it entered into force. The United States was proud to celebrate the 50th anniversary of this important milestone, as well as the immeasurable contribution this landmark treaty has made to international security.

In honor of the 50th anniversary of the Treaty on the Non-Proliferation of Nuclear Weapons, and to mark the occasionthe United States embarked on a historical access project to make formerly classified documents relating to NPT history available to the public for the first time.

Historical Documents and Photos

On March 5, 2020, 50 years after the treaty entered into force, the State Department released scores of documents from the records of the Arms Control and Disarmament Agency (ACDA) covering the negotiation, signature, and ratification of the NPT. These documents are posted on the Department’s FOIA website. The United Kingdom and NATO also released their own collections of documents on their respective roles in support of NPT negotiations in honor of the 50th anniversary.

The United States also released key documents relating to the history of the negotiation of the NPT on June 28, 2018.  These were compiled by ACDA, along with the histories for other treaties negotiated in in the Eighteen-Nation Disarmament Committee. Additional declassified scenario documents and background memos for the NPT’s signing in Washington were released July 1, 1968. These documents are posted on the Department’s FOIA website.

Additional documents related to the negotiation of the NPT can be found under Foreign Relations of the United States, as well as on the Department’s FOIA website.

Further resources on the origins of the NPT are available at the Lyndon B. Johnson Library,  the National Archives   and the Woodrow Wilson Center . The United Kingdom and NATO have also released their own collections of documents on their respective roles in support of NPT negotiations.

U.S. Department of State

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