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"The Invisible Line" shines light on one of the most important, but too often hidden, aspects of American history and culture. Sharfstein's narrative of three families negotiating America's punishing racial terrain is a must read for all who are interested in the construction of race in the United States." --Annette Gordon-Reed, Pulitzer Prize winning author of The Hemingses of Monticello In America, race is a riddle. The stories we tell about our past have calcified into the fiction that we are neatly divided into black or white. It is only with the widespread availability of DNA testing and the boom in genealogical research that the frequency with which individuals and entire families crossed the color line has become clear. In this sweeping history, Daniel J.