### Signing of the North Atlantic Treaty **Date**: April 4, 1949 • **Location**: Washington, United States Twelve nations signed the North Atlantic Treaty, establishing NATO, an international military alliance whereby its member states agree to mutual defense in response to an attack by any external party. The North Atlantic Treaty, also known as the Washington Treaty, forms the legal basis of, and is implemented by, the North Atlantic Treaty Organization (NATO). The treaty was signed in Washington, D.C., on 4 April 1949.

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