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        By Daniel Rook and Jean Arce   Claudia Sheinbaum was elected Mexico's first woman president by a landslide Sunday, preliminary official results showed, making history in a country plagued by rampant criminal and gender-based violence. Crowds of flag-waving supporters sang and danced to mariachi music in Mexico City's main square celebrating the ruling party candidate's victory. The 61-year-old former Mexico City mayor, a scientist by training, […]