Book excerpt: A remarkable history of First Lady Michelle Obama’s mixed ancestry, American Tapestry by Rachel L. Swarns is nothing less than a breathtaking and expansive portrait of America itself. In this extraordinary feat of genealogical research—in the tradition of The Hemmingses of Monticello and Slaves in the Family—author Swarns, a respected Washington-based reporter for the New York Times, tells the fascinating and hitherto untold story of Ms. Obama’s black, white, and multiracial ancestors; a history that the First Lady herself did not know. At once epic, provocative, and inspiring, American Tapestry is more than a true family saga; it is an illuminating mirror in which we may all see ourselves.