Seventy-five years ago twelve nations formed an alliance of military and political cooperation.
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75 Years of Alliance

Signing of the North Atlantic Treaty

Seventy-five years ago on April 4, 1949, foreign ministers from the United States and 11 countries (Belgium, Canada, Denmark, France, Iceland, Italy, Luxembourg, the Netherlands, Norway, Portugal, and the United Kingdom) gathered in Washington, DC to sign the Washington Treaty.  Also known as the North Atlantic Treaty, the treaty derives its authority from Article 51 of the United Nations Charter. Article 51 affirms the inherent right of individual or collective self-defense.

Signing of the North Atlantic Treaty, April 4, 1949, National Archives Identifier 348262809

The treaty and the North Atlantic Treaty Organization’s purpose was to guarantee the freedom and security of its members through military and political cooperation.

North Atlantic Treaty

North Atlantic Treaty, April 4, 1949 (page 2), National Archives Identifier 348806325

Listen to President Harry S. Truman’s address at the signing  of the North Atlantic Treaty and explore a timeline on the development of NATO from the Harry S. Truman Presidential Library and Museum.

Truman arriving for signing of North Atlantic Treaty

Truman arriving for signing of North Atlantic Treaty, April 4, 1949, National Archives Identifier 350286841

 

After the signing of the Washington Treaty (North Atlantic Treaty), all member nations needed to ratify the agreement.  The United States Senate debated the ratification from July 5th to July  8th and eventually  approved the Treaty on July 21, 1949 by a vote of 83 to 13. The treaty came into effect on October 24, 1949.  

 

Seventy-five years later, NATO now has 32 member countries.

Truman Signing North Atlantic Treaty Proclamation
man signing North Atlantic Treaty document

Left: Truman Signing North Atlantic Treaty Proclamation, July 25, 1949, National Archives Identifier 338957530

Right: Truman signing North Atlantic Treaty document, July 25, 1949, National Archives Identifier 348451106

The NATO Archives are held in the NATO headquarters in Brussels, Belgium, but you can find many records relating to NATO in the National Archives. NATO related records can be found in military, diplomatic, and legislative record groups as well as presidential records beginning with President Truman.

President Nixon addresses the North Atlantic Treaty Organization (NATO)
President George W. Bush Delivers Remarks at a North Atlantic Treaty Organization (NATO) Signing Ceremony
Combat-ready Marines of the 4th Marine Amphibious Brigade charge out of LVTP-7 tracked landing vehicles on Red Beach during the NATO exercise Northern Wedding
President Barack Obama Greeting NATO Allies

Top left: President Nixon addresses the North Atlantic Treaty Organization (NATO), February 24, 1969,  National Archives Identifier 194607  Top right: President George W. Bush Delivers Remarks at a North Atlantic Treaty Organization (NATO) Signing Ceremony, October 24, 2008,  National Archives Identifier 176892010 

Bottom left: Combat-ready Marines of the 4th Marine Amphibious Brigade charge out of LVTP-7 tracked landing vehicles on Red Beach during the NATO exercise Northern Wedding, September 1, 1978, National Archives Identifier 6348962 Bottom right: President Barack Obama Greeting NATO Allies,  July 8, 2016, National Archives Identifier 241338186

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History Hub

Start your research on History Hub

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Are you researching the history of NATO? Be sure to visit the History Hub and the links below for information on records relating to U.S. military and diplomatic cooperation in post-WWII Europe. 

 

Seeking US diplomatic, NATO, & military records

 

Where are records of military assistance units in Turkey, 1973-1974?

 

How do I find former U.S Administration diplomatic activities by region?

 

Seeking intelligence reports and briefings on the MiG-25

 

Blog Post: An Introductory Guide to Foreign Relations of the United States (FRUS)

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