ACROSS the United States, American citizens are forced underground, exiled abroad and separated from their spouses for a surprising reason. "Amor and Exile" is the story of American citizens-including Veronica, Ben, J.W., and Nicole-who fall in love with undocumented immigrants only to find themselves trapped in a legal labyrinth, stymied by their country's de facto exclusion of their partners. Journalist Nathaniel Hoffman visited both sides of the border to document the lives of these couples caught in the crossfire of America's high stakes political fight over immigration. In his...