bhutan. a place of legendary beauty. the fabled shan shangri la. >> what are the bhutanese told about the american dream? >> sidewalks paved with gold. if you work hard, but it takes time, maybe, people feel it's too long to get that dream. >> bhutanese refugees in america have been killing themselves higher than any other refugee population, with rates of depression running three times the u.s. national average. >> it's tragic. it's epidemic. >> the roots of the problem go backs to bhutan itself. until the 1990s, sam lived there in harmony. >> that harmony was destroyed when the former king of bhutan mandated a so-called one nation, one people policy, effectively a system for ethnic cleansing. a sixth of the population, more than 100,000 bhutanese of anyone allies origin, were brutalized. >> there is no hope no future. there is no identity. i'm one of the survivors. >> reporter: there are more than 20,000 anyone ali speaking bhutanese still suffering in refugee camps in an nepal. they are one of the fastest refugee grou