Actually any one person can compete..such as if a person from the US competed in the Swedish melodifestivalen and won the right to represent Sweden, then they could. Eurovision is just so popular in Australia they were invited to be a guest participant. But it is also very political...such as the UK really never winning regardless of song and being one of the main countries in the event.
I am sure that if the US pushed hard enough, they probably could also be invited to participate. America first and all.
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