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ANZUS Pact (Australia-New Zealand-United States Treaty Organization) Military alliance organized by the US in 1951. ANZUS was set up in response to waning British power, the Korean War (1950–53), and alarm at increasing Soviet influence in the Pacific. The treaty stated that an attack on any one of the three countries would be considered as an attack on them all. It was replaced in 1954 by the Southeast Asia Treaty Organization (SEATO).