Thanks to Pinterest boards and Instagram hashtags, the word "authentic" has passed from buzzword into the realm of parody: think Portlandia-style farm-to-table spreads, mountain-top selfies and any fashion shoot set in Joshua Tree. But in Mark Sundeen's "The Unsettlers: In Search of the Good Life in Today's America" (Riverhead, $26), three American families ditch modern comforts and convenience… including, in some cases, supermarkets, cars and even electricity … to define [...]
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