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Events on Saturday 1 September 1951 1
1951ANZUS Treaty SignedAustralia, New Zealand, and the United States form a security pactAustralia, New Zealand, and the United States signed the ANZUS security treaty in San Francisco, committing to mutual defense in the Pacific. The pact reflected postwar concerns about communist expansion in Asia and reduced the three nations' reliance on Britain for regional security. It remains a cornerstone of Australian and New Zealand defense policy.