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Many countries other than the US are comprised of a federation of states. And also those that aren't are generally considered nation states or sovereign states, which are still definitively states. The United States of America do not have an exclusive right on statehood.
Plus even though it may be implied that the original replier intended the context to mean the United States of America... it is a valid response with further implication that one should check their local jurisdiction's laws if they were so inclined to do so.