Nicholas Kristof grew up, in rural Yamhill, Oregon, an area that prospered for much of the twentieth century but has been devastated in the last few decades as blue-collar jobs disappeared. About one-quarter of the children on Kristof's old school bus died in adulthood from drugs, alcohol, suicide, or reckless accidents. And while these particular stories unfolded in one corner of the country, they are representative of many places the authors write...