Matt Frei talks to the Harvard University professor, Robert Putnam, about his newest book, American Grace. They consider faith and the impact of religious affiliation on the culture of the nation. Americana follows the historian, Walter Borneman, on a vintage train ride to retrace one of America's most famous transcontinental rail routes. The railway played an essential role in America's westward expansion. And the author and activist Alice Walker, perhaps most famous for her novel, The Color Purple, has published a new book of poetry, Hard Times Require Furious Dancing. She explains her style of faith and how to find and share hope when facing challenging situations.