The English-Speaking Union of the United States 2006 Ambassador Book Awards   American Studies: A Great Improvisation: Franklin, France, and the Birth of America, Stacy Schiff; Henry Holt and Co. Biography & Autobiography: American Prometheus: The Triumph and Tragedy of J. Robert Oppenheimer , Kai Bird, Martin Sherwin; Alfred A. Knopf Fiction: Liberation: A Novel , Joanna Scott; Little, Brown Poetry: Migration , W.S. Merwin; Copper Canyon Press