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What are the primary US allies?
How long have these countries been allies with the US?
The duration of US alliances varies for each country. For instance, the US and Canada have been allies since the War of 1812. The US and Japan officially became allies through the signing of the US-Japan Mutual Defense Assistance Agreement in 1954. South Korea and the US became allies after the Korean War. The US has had close ties with Britain since World War II. The US established a strategic partnership with Germany after the Cold War ended. The US and France have had diplomatic relations since the American Revolution. The US and Italy have had strong bilateral relations since World War II. The US and Australia have been close allies since World War II.