'Who Do You Think You Are? USA' follows the journeys of six well known US personalities as they explore their family trees, uncover their family history and discover surprising and enlightening facts about their heritage that until now have been lost in time. One finds a long lost relative in Europe, while another finds someone unexpected nearer home. One uncovers the secret life of an absent Grandmother, another finds their heart beats with Royal blood. One finds honour and solves an historic mystery on a Civil War battlefield, another finds themselves immersed in the Salem Witch Trials. The USA is a young country, but its stories reach back through many generations, often uncovering breathtaking revelations and bloodlines that made history.