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There are both usa and united-states tags. I'm not sure which one should end up being the primary one, because Tag merge - uk and united-kingdom indicates it should be united-states but that's the lesser used tag at the moment.
This looks to have been forgotten back then. I checked, and it looks like people used the usa tag more often (1000 vs 100), so united-states was merged into usa.
This suggestion was made almost three years ago, and it seems reasonable to me, but there's been no action. Is there any reason to continue to have both tags?