If China seems unstoppable, so too does its leader Xi Jinping. As general secretary of the Chinese Communist Party and president of China, he commands over 1.4 billion people, in a vast country that spans the prosperous megacities of Beijing and Shanghai and desperately poor rural regions where families still struggle with malnutrition.Today, Xi Jinping faces a series of monumental challenges that would make other global leaders tremble: a trade war with the USA, political unrest i...