Driving from Naples, Florida, the nation’s second-wealthiest metropolitan area, to Immokalee takes less than an hour on a straight road. You pass houses that sell for an average of $1.4 million, shopping malls anchored by Tiffany’s and Saks Fifth Avenue, manicured golf courses. Eventually, gated communities with names like Monaco Beach Club and Imperial Golf Estates give way to modest ranches, and the highway shrivels from six lanes to two. Through the scruffy palmettos, you glimpse flat, sandy tomato fields shimmering in the broiling sun. Rounding a long curve, you enter Immokalee.