Inside the US, we don't refer to ourselves as "American", we seem to go by whatever the hell our descent was, but outside of the US we refer to ourselves as "American".
Is America the only country that does this?
Also, on another note: To all you who are not native English speakers: When you buy a videogame, do you play it in English or your native language?
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There's no point telling people in side of America that you are American... the logic there doesn't make sense.