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Culture and values:
15. Uncle Sam Day( September 13th) celebrates a symbol of America. Uncle Sam is certainly one of America`s ____ recognized symbols. Uncle Sam appears on everything from military posters to cartoon images to advertising media.

15. Uncle Sam Day( September 13th) celebrates a symbol of America. Uncle Sam is certainly one of America`s __most/widely__ recognized symbols. Uncle Sam appears on everything from military posters to cartoon images to advertising media.