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 Our series on America\u2019s mid-term elections begins with a visit to a citizenship class in Doral, Florida, given by Republicans. We examine how the GOP is cutting into Democrats\u2019 advantage with Latino voters. Britain\u2019s trial of a superhighway for drones is a bid to unleash their commercial potential. And meeting   a Thai dissident issuing dystopian pop music from self-imposed exile. For full access to print, digital and audio editions of The Economist, subscribe here www.economist.com/intelligenceoffer